165377640 has 32 divisors (see below), whose sum is σ = 496133280. Its totient is φ = 44100672.

The previous prime is 165377629. The next prime is 165377651. The reversal of 165377640 is 46773561.

It is an interprime number because it is at equal distance from previous prime (165377629) and next prime (165377651).

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, 688954 + ... + 689193.

It is an arithmetic number, because the mean of its divisors is an integer number (15504165).

Almost surely, 2^165377640 is an apocalyptic number.

165377640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165377640 is an abundant number, since it is smaller than the sum of its proper divisors (330755640).

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

165377640 is a wasteful number, since it uses less digits than its factorization.

165377640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378161 (or 1378157 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 165377640 is about 12859.9237944865. The cubic root of 165377640 is about 548.8987772943.

The spelling of 165377640 in words is "one hundred sixty-five million, three hundred seventy-seven thousand, six hundred forty".