165400256 has 28 divisors (see below), whose sum is σ = 375105168. Its totient is φ = 70885632.

The previous prime is 165400217. The next prime is 165400267. The reversal of 165400256 is 652004561.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184151 + ... + 185046.

Almost surely, 2^165400256 is an apocalyptic number.

165400256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165400256 is an abundant number, since it is smaller than the sum of its proper divisors (209704912).

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

165400256 is an equidigital number, since it uses as much as digits as its factorization.

165400256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369216 (or 369206 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 165400256 is about 12860.8030853442. The cubic root of 165400256 is about 548.9237974621.

The spelling of 165400256 in words is "one hundred sixty-five million, four hundred thousand, two hundred fifty-six".