165731980 has 24 divisors (see below), whose sum is σ = 368510688. Its totient is φ = 62393088.

The previous prime is 165731977. The next prime is 165731981. The reversal of 165731980 is 89137561.

165731980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (165731981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243384 + ... + 244063.

It is an arithmetic number, because the mean of its divisors is an integer number (15354612).

Almost surely, 2^165731980 is an apocalyptic number.

165731980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165731980 is an abundant number, since it is smaller than the sum of its proper divisors (202778708).

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

165731980 is a wasteful number, since it uses less digits than its factorization.

165731980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487473 (or 487471 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 165731980 is about 12873.6933317522. The cubic root of 165731980 is about 549.2905232149.

The spelling of 165731980 in words is "one hundred sixty-five million, seven hundred thirty-one thousand, nine hundred eighty".