155665550566556 has 6 divisors (see below), whose sum is σ = 272414713491480. Its totient is φ = 77832775283276.

The previous prime is 155665550566531. The next prime is 155665550566573. The reversal of 155665550566556 is 655665055566551.

155665550566556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155665550566556² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155665550566556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19458193820816 + ... + 19458193820823.

It is an arithmetic number, because the mean of its divisors is an integer number (45402452248580).

Almost surely, 2^{155665550566556} is an apocalyptic number.

It is an amenable number.

155665550566556 is a deficient number, since it is larger than the sum of its proper divisors (116749162924924).

155665550566556 is a wasteful number, since it uses less digits than its factorization.

155665550566556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38916387641643 (or 38916387641641 counting only the distinct ones).

The product of its (nonzero) digits is 3037500000, while the sum is 71.

The spelling of 155665550566556 in words is "one hundred fifty-five trillion, six hundred sixty-five billion, five hundred fifty million, five hundred sixty-six thousand, five hundred fifty-six".