121656081576 has 128 divisors (see below), whose sum is σ = 309780132480. Its totient is φ = 39808598016.

The previous prime is 121656081571. The next prime is 121656081583. The reversal of 121656081576 is 675180656121.

It is not an unprimeable number, because it can be changed into a prime (121656081571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260505295 + ... + 260505761.

It is an arithmetic number, because the mean of its divisors is an integer number (2420157285).

Almost surely, 2^121656081576 is an apocalyptic number.

It is an amenable number.

121656081576 is an abundant number, since it is smaller than the sum of its proper divisors (188124050904).

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

121656081576 is a wasteful number, since it uses less digits than its factorization.

121656081576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243 (or 1239 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 121656081576 in words is "one hundred twenty-one billion, six hundred fifty-six million, eighty-one thousand, five hundred seventy-six".