165220665223556 has 48 divisors (see below), whose sum is σ = 292555891756800. Its totient is φ = 81634368532992.

The previous prime is 165220665223543. The next prime is 165220665223567. The reversal of 165220665223556 is 655322566022561.

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, 4590337496 + ... + 4590373488.

It is an arithmetic number, because the mean of its divisors is an integer number (6094914411600).

Almost surely, 2^{165220665223556} is an apocalyptic number.

It is an amenable number.

165220665223556 is a deficient number, since it is larger than the sum of its proper divisors (127335226533244).

165220665223556 is a wasteful number, since it uses less digits than its factorization.

165220665223556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43268 (or 43266 counting only the distinct ones).

The product of its (nonzero) digits is 38880000, while the sum is 56.

The spelling of 165220665223556 in words is "one hundred sixty-five trillion, two hundred twenty billion, six hundred sixty-five million, two hundred twenty-three thousand, five hundred fifty-six".