16165565000 has 80 divisors (see below), whose sum is σ = 40789615020. Its totient is φ = 5968800000.

The previous prime is 16165564997. The next prime is 16165565063. The reversal of 16165565000 is 56556161.

It can be written as a sum of positive squares in 10 ways, for example, as 2479840804 + 13685724196 = 49798^2 + 116986^2 .

It is a super-2 number, since 2×16165565000² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 59351 + ... + 189350.

Almost surely, 2^16165565000 is an apocalyptic number.

16165565000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16165565000 is an abundant number, since it is smaller than the sum of its proper divisors (24624050020).

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

16165565000 is a wasteful number, since it uses less digits than its factorization.

16165565000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248740 (or 248721 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 16165565000 in words is "sixteen billion, one hundred sixty-five million, five hundred sixty-five thousand".