165851966 has 24 divisors (see below), whose sum is σ = 306421056. Its totient is φ = 66897600.

The previous prime is 165851923. The next prime is 165851971. The reversal of 165851966 is 669158561.

It is a self number, because there is not a number n which added to its sum of digits gives 165851966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48110 + ... + 51441.

It is an arithmetic number, because the mean of its divisors is an integer number (12767544).

Almost surely, 2^165851966 is an apocalyptic number.

165851966 is a deficient number, since it is larger than the sum of its proper divisors (140569090).

165851966 is a wasteful number, since it uses less digits than its factorization.

165851966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99584 (or 99577 counting only the distinct ones).

The product of its digits is 388800, while the sum is 47.

The square root of 165851966 is about 12878.3526120385. The cubic root of 165851966 is about 549.4230489834.

The spelling of 165851966 in words is "one hundred sixty-five million, eight hundred fifty-one thousand, nine hundred sixty-six".