201556072015506 has 32 divisors (see below), whose sum is σ = 482356411662720. Its totient is φ = 62017252927632.

The previous prime is 201556072015499. The next prime is 201556072015523. The reversal of 201556072015506 is 605510270655102.

201556072015506 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 5 + 60 + 72 + 0 + 15 + 506 = 666.

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, 143558455150 + ... + 143558456553.

It is an arithmetic number, because the mean of its divisors is an integer number (15073637864460).

Almost surely, 2^{201556072015506} is an apocalyptic number.

201556072015506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

201556072015506 is an abundant number, since it is smaller than the sum of its proper divisors (280800339647214).

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

201556072015506 is a wasteful number, since it uses less digits than its factorization.

201556072015506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287116911727 (or 287116911721 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 45.

The spelling of 201556072015506 in words is "two hundred one trillion, five hundred fifty-six billion, seventy-two million, fifteen thousand, five hundred six".