165313640 has 32 divisors (see below), whose sum is σ = 381031560. Its totient is φ = 64512000.

The previous prime is 165313639. The next prime is 165313703. The reversal of 165313640 is 46313561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 29311396 + 136002244 = 5414^2 + 11662^2 .

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, 48761 + ... + 52040.

Almost surely, 2^165313640 is an apocalyptic number.

165313640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165313640 is an abundant number, since it is smaller than the sum of its proper divisors (215717920).

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

165313640 is a wasteful number, since it uses less digits than its factorization.

165313640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100853 (or 100849 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 165313640 is about 12857.4352030255. The cubic root of 165313640 is about 548.8279614848.

The spelling of 165313640 in words is "one hundred sixty-five million, three hundred thirteen thousand, six hundred forty".