121686755660 has 48 divisors (see below), whose sum is σ = 256299603840. Its totient is φ = 48530584320.

The previous prime is 121686755647. The next prime is 121686755699. The reversal of 121686755660 is 66557686121.

It is a happy number.

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, 17210606 + ... + 17217674.

It is an arithmetic number, because the mean of its divisors is an integer number (5339575080).

Almost surely, 2^121686755660 is an apocalyptic number.

121686755660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121686755660 is an abundant number, since it is smaller than the sum of its proper divisors (134612848180).

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

121686755660 is a wasteful number, since it uses less digits than its factorization.

121686755660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9506 (or 9504 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 121686755660 in words is "one hundred twenty-one billion, six hundred eighty-six million, seven hundred fifty-five thousand, six hundred sixty".