16551572122656 has 240 divisors, whose sum is σ = 53203729582080. Its totient is φ = 5025144821760.

The previous prime is 16551572122619. The next prime is 16551572122691. The reversal of 16551572122656 is 65622127515561.

16551572122656 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 1 + 572 + 1 + 2 + 2 + 65 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4692496 + ... + 7424463.

It is an arithmetic number, because the mean of its divisors is an integer number (221682206592).

Almost surely, 2^{16551572122656} is an apocalyptic number.

16551572122656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16551572122656 is an abundant number, since it is smaller than the sum of its proper divisors (36652157459424).

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

16551572122656 is a wasteful number, since it uses less digits than its factorization.

16551572122656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12117029 (or 12117012 counting only the distinct ones).

The product of its digits is 7560000, while the sum is 54.

The spelling of 16551572122656 in words is "sixteen trillion, five hundred fifty-one billion, five hundred seventy-two million, one hundred twenty-two thousand, six hundred fifty-six".