165322640 has 40 divisors (see below), whose sum is σ = 439287360. Its totient is φ = 56681856.

The previous prime is 165322639. The next prime is 165322669. The reversal of 165322640 is 46223561.

It is a tau number, because it is divible by the number of its divisors (40).

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, 147050 + ... + 148169.

It is an arithmetic number, because the mean of its divisors is an integer number (10982184).

Almost surely, 2^165322640 is an apocalyptic number.

165322640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165322640 is an abundant number, since it is smaller than the sum of its proper divisors (273964720).

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

165322640 is a wasteful number, since it uses less digits than its factorization.

165322640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295239 (or 295233 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 165322640 is about 12857.7851903040. The cubic root of 165322640 is about 548.8379210623.

The spelling of 165322640 in words is "one hundred sixty-five million, three hundred twenty-two thousand, six hundred forty".