16165640 has 32 divisors (see below), whose sum is σ = 38513880. Its totient is φ = 6085632.

The previous prime is 16165627. The next prime is 16165717. The reversal of 16165640 is 4656161.

16165640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13060996 + 3104644 = 3614^2 + 1762^2 .

It is a super-2 number, since 2×16165640² = 522655833219200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11207 + ... + 12566.

Almost surely, 2^16165640 is an apocalyptic number.

16165640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16165640 is an abundant number, since it is smaller than the sum of its proper divisors (22348240).

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

16165640 is a wasteful number, since it uses less digits than its factorization.

16165640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23801 (or 23797 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 16165640 is about 4020.6516884704. The cubic root of 16165640 is about 252.8507819390.

The spelling of 16165640 in words is "sixteen million, one hundred sixty-five thousand, six hundred forty".