121556622673983 has 32 divisors (see below), whose sum is σ = 188369983065600. Its totient is φ = 68283127921536.

The previous prime is 121556622673961. The next prime is 121556622673999. The reversal of 121556622673983 is 389376226655121.

It is a Cunningham number, because it is equal to 11025272²-1.

It is not a de Polignac number, because 121556622673983 - 2³⁷ = 121419183720511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121556622673883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231268185 + ... + 231793197.

It is an arithmetic number, because the mean of its divisors is an integer number (5886561970800).

Almost surely, 2^{121556622673983} is an apocalyptic number.

121556622673983 is a deficient number, since it is larger than the sum of its proper divisors (66813360391617).

121556622673983 is a wasteful number, since it uses less digits than its factorization.

121556622673983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711951.

The product of its digits is 195955200, while the sum is 66.

The spelling of 121556622673983 in words is "one hundred twenty-one trillion, five hundred fifty-six billion, six hundred twenty-two million, six hundred seventy-three thousand, nine hundred eighty-three".