121156165164 has 24 divisors (see below), whose sum is σ = 282703841280. Its totient is φ = 40384513744.

The previous prime is 121156165133. The next prime is 121156165201. The reversal of 121156165164 is 461561651121.

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, 718657 + ... + 871079.

It is an arithmetic number, because the mean of its divisors is an integer number (11779326720).

Almost surely, 2^121156165164 is an apocalyptic number.

It is an amenable number.

121156165164 is an abundant number, since it is smaller than the sum of its proper divisors (161547676116).

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

121156165164 is a wasteful number, since it uses less digits than its factorization.

121156165164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218669 (or 218667 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The spelling of 121156165164 in words is "one hundred twenty-one billion, one hundred fifty-six million, one hundred sixty-five thousand, one hundred sixty-four".