15221375186856 has 32 divisors (see below), whose sum is σ = 38353071344640. Its totient is φ = 5033840611968.

The previous prime is 15221375186837. The next prime is 15221375186867. The reversal of 15221375186856 is 65868157312251.

It is a self number, because there is not a number n which added to its sum of digits gives 15221375186856.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2496941701 + ... + 2496947796.

It is an arithmetic number, because the mean of its divisors is an integer number (1198533479520).

Almost surely, 2^{15221375186856} is an apocalyptic number.

It is an amenable number.

15221375186856 is an abundant number, since it is smaller than the sum of its proper divisors (23131696157784).

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

15221375186856 is a wasteful number, since it uses less digits than its factorization.

15221375186856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993889633 (or 4993889629 counting only the distinct ones).

The product of its digits is 24192000, while the sum is 60.

The spelling of 15221375186856 in words is "fifteen trillion, two hundred twenty-one billion, three hundred seventy-five million, one hundred eighty-six thousand, eight hundred fifty-six".