1665665232 has 120 divisors (see below), whose sum is σ = 5460623712. Its totient is φ = 432633600.

The previous prime is 1665665231. The next prime is 1665665233. The reversal of 1665665232 is 2325665661.

It is an interprime number because it is at equal distance from previous prime (1665665231) and next prime (1665665233).

It is a super-2 number, since 2×1665665232² = 5548881330187227648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665665231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6319 + ... + 58062.

Almost surely, 2^1665665232 is an apocalyptic number.

1665665232 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 1665665232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2730311856).

1665665232 is an abundant number, since it is smaller than the sum of its proper divisors (3794958480).

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

1665665232 is a wasteful number, since it uses less digits than its factorization.

1665665232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64417 (or 64404 counting only the distinct ones).

The product of its digits is 388800, while the sum is 42.

The square root of 1665665232 is about 40812.5621837199. The cubic root of 1665665232 is about 1185.3935875020.

The spelling of 1665665232 in words is "one billion, six hundred sixty-five million, six hundred sixty-five thousand, two hundred thirty-two".