1665151650 has 72 divisors (see below), whose sum is σ = 4518124884. Its totient is φ = 439632000.

The previous prime is 1665151633. The next prime is 1665151661. The reversal of 1665151650 is 561515661.

It can be written as a sum of positive squares in 6 ways, for example, as 961682121 + 703469529 = 31011^2 + 26523^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 27132 + ... + 63768.

Almost surely, 2^1665151650 is an apocalyptic number.

1665151650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665151650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2259062442).

1665151650 is an abundant number, since it is smaller than the sum of its proper divisors (2852973234).

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

1665151650 is a wasteful number, since it uses less digits than its factorization.

1665151650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36756 (or 36748 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1665151650 is about 40806.2697388526. The cubic root of 1665151650 is about 1185.2717424118.

The spelling of 1665151650 in words is "one billion, six hundred sixty-five million, one hundred fifty-one thousand, six hundred fifty".