165996680 has 32 divisors (see below), whose sum is σ = 378000000. Its totient is φ = 65597376.

The previous prime is 165996679. The next prime is 165996683. The reversal of 165996680 is 86699561.

It is not an unprimeable number, because it can be changed into a prime (165996683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21680 + ... + 28319.

It is an arithmetic number, because the mean of its divisors is an integer number (11812500).

Almost surely, 2^165996680 is an apocalyptic number.

165996680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165996680 is an abundant number, since it is smaller than the sum of its proper divisors (212003320).

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

165996680 is a wasteful number, since it uses less digits than its factorization.

165996680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50093 (or 50089 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 165996680 is about 12883.9698850936. The cubic root of 165996680 is about 549.5828020753.

The spelling of 165996680 in words is "one hundred sixty-five million, nine hundred ninety-six thousand, six hundred eighty".