155566556656 has 40 divisors (see below), whose sum is σ = 344620916064. Its totient is φ = 66641940480.

The previous prime is 155566556627. The next prime is 155566556669. The reversal of 155566556656 is 656655665551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 155566556594 and 155566556603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50965 + ... + 560116.

Almost surely, 2^155566556656 is an apocalyptic number.

155566556656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

155566556656 is an abundant number, since it is smaller than the sum of its proper divisors (189054359408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155566556656 is a wasteful number, since it uses less digits than its factorization.

155566556656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613369 (or 613363 counting only the distinct ones).

The product of its digits is 121500000, while the sum is 61.

The spelling of 155566556656 in words is "one hundred fifty-five billion, five hundred sixty-six million, five hundred fifty-six thousand, six hundred fifty-six".