165975780 has 24 divisors (see below), whose sum is σ = 464732352. Its totient is φ = 44260192.

The previous prime is 165975779. The next prime is 165975809. The reversal of 165975780 is 87579561.

165975780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1383072 + ... + 1383191.

It is an arithmetic number, because the mean of its divisors is an integer number (19363848).

Almost surely, 2^165975780 is an apocalyptic number.

165975780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165975780 is an abundant number, since it is smaller than the sum of its proper divisors (298756572).

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

165975780 is a wasteful number, since it uses less digits than its factorization.

165975780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766275 (or 2766273 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 48.

The square root of 165975780 is about 12883.1587741516. The cubic root of 165975780 is about 549.5597358255.

The spelling of 165975780 in words is "one hundred sixty-five million, nine hundred seventy-five thousand, seven hundred eighty".