1665503532 has 486 divisors, whose sum is σ = 5930131116. Its totient is φ = 407151360.

The previous prime is 1665503509. The next prime is 1665503569. The reversal of 1665503532 is 2353055661.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

1665503532 is a `hidden beast` number, since 16 + 65 + 50 + 3 + 532 = 666.

It is a tau number, because it is divible by the number of its divisors (486).

It is a super-3 number, since 3×1665503532³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 161 ways as a sum of consecutive naturals, for example, 97970788 + ... + 97970804.

Almost surely, 2^1665503532 is an apocalyptic number.

1665503532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665503532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2965065558).

1665503532 is an abundant number, since it is smaller than the sum of its proper divisors (4264627584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665503532 is a wasteful number, since it uses less digits than its factorization.

1665503532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 1665503532 is about 40810.5811279379. The cubic root of 1665503532 is about 1185.3552275838.

The spelling of 1665503532 in words is "one billion, six hundred sixty-five million, five hundred three thousand, five hundred thirty-two".