165786611656 has 8 divisors (see below), whose sum is σ = 310849896870. Its totient is φ = 82893305824.

The previous prime is 165786611611. The next prime is 165786611663. The reversal of 165786611656 is 656116687561.

It can be written as a sum of positive squares in only one way, i.e., 153794171556 + 11992440100 = 392166^2 + 109510^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 165786611656.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10361663221 + ... + 10361663236.

Almost surely, 2^165786611656 is an apocalyptic number.

It is an amenable number.

165786611656 is a deficient number, since it is larger than the sum of its proper divisors (145063285214).

165786611656 is a wasteful number, since it uses less digits than its factorization.

165786611656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20723326463 (or 20723326459 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 58.

The spelling of 165786611656 in words is "one hundred sixty-five billion, seven hundred eighty-six million, six hundred eleven thousand, six hundred fifty-six".