165660356 has 6 divisors (see below), whose sum is σ = 289905630. Its totient is φ = 82830176.

The previous prime is 165660353. The next prime is 165660361. The reversal of 165660356 is 653066561.

It can be written as a sum of positive squares in only one way, i.e., 162970756 + 2689600 = 12766^2 + 1640^2 .

It is not an unprimeable number, because it can be changed into a prime (165660353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20707541 + ... + 20707548.

It is an arithmetic number, because the mean of its divisors is an integer number (48317605).

Almost surely, 2^165660356 is an apocalyptic number.

It is an amenable number.

165660356 is a deficient number, since it is larger than the sum of its proper divisors (124245274).

165660356 is a wasteful number, since it uses less digits than its factorization.

165660356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41415093 (or 41415091 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 165660356 is about 12870.9112342522. The cubic root of 165660356 is about 549.2113832821.

The spelling of 165660356 in words is "one hundred sixty-five million, six hundred sixty thousand, three hundred fifty-six".