121559830656 has 128 divisors (see below), whose sum is σ = 370786809600. Its totient is φ = 34897536000.

The previous prime is 121559830643. The next prime is 121559830663. The reversal of 121559830656 is 656038955121.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 121559830599 and 121559830608.

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, 677070 + ... + 837581.

It is an arithmetic number, because the mean of its divisors is an integer number (2896771950).

Almost surely, 2^121559830656 is an apocalyptic number.

121559830656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121559830656 is an abundant number, since it is smaller than the sum of its proper divisors (249226978944).

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

121559830656 is a wasteful number, since it uses less digits than its factorization.

121559830656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514698 (or 1514686 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 51.

The spelling of 121559830656 in words is "one hundred twenty-one billion, five hundred fifty-nine million, eight hundred thirty thousand, six hundred fifty-six".