165661930 has 32 divisors (see below), whose sum is σ = 344632320. Its totient is φ = 56158080.

The previous prime is 165661901. The next prime is 165661961. The reversal of 165661930 is 39166561.

It is a self number, because there is not a number n which added to its sum of digits gives 165661930.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7066 + ... + 19525.

It is an arithmetic number, because the mean of its divisors is an integer number (10769760).

Almost surely, 2^165661930 is an apocalyptic number.

165661930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165661930 is an abundant number, since it is smaller than the sum of its proper divisors (178970390).

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

165661930 is a wasteful number, since it uses less digits than its factorization.

165661930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26694.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 165661930 is about 12870.9723797388. The cubic root of 165661930 is about 549.2131226964.

It can be divided in two parts, 16566 and 1930, that added together give a square (18496 = 136²).

The spelling of 165661930 in words is "one hundred sixty-five million, six hundred sixty-one thousand, nine hundred thirty".