165697772 has 12 divisors (see below), whose sum is σ = 292842816. Its totient is φ = 82028400.

The previous prime is 165697751. The next prime is 165697811. The reversal of 165697772 is 277796561.

It is a self number, because there is not a number n which added to its sum of digits gives 165697772.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204668 + ... + 205475.

It is an arithmetic number, because the mean of its divisors is an integer number (24403568).

Almost surely, 2^165697772 is an apocalyptic number.

It is an amenable number.

165697772 is a deficient number, since it is larger than the sum of its proper divisors (127145044).

165697772 is a wasteful number, since it uses less digits than its factorization.

165697772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410248 (or 410246 counting only the distinct ones).

The product of its digits is 1111320, while the sum is 50.

The square root of 165697772 is about 12872.3646623299. The cubic root of 165697772 is about 549.2527284108.

The spelling of 165697772 in words is "one hundred sixty-five million, six hundred ninety-seven thousand, seven hundred seventy-two".