165368640 has 56 divisors (see below), whose sum is σ = 525048480. Its totient is φ = 44098048.

The previous prime is 165368633. The next prime is 165368653. The reversal of 165368640 is 46863561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85170 + ... + 87089.

Almost surely, 2^165368640 is an apocalyptic number.

165368640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165368640 is an abundant number, since it is smaller than the sum of its proper divisors (359679840).

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

165368640 is a wasteful number, since it uses less digits than its factorization.

165368640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172279 (or 172269 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 165368640 is about 12859.5738654125. The cubic root of 165368640 is about 548.8888199252. Note that the first 4 decimals are identical.

The spelling of 165368640 in words is "one hundred sixty-five million, three hundred sixty-eight thousand, six hundred forty".