121656163612 has 24 divisors (see below), whose sum is σ = 216112908816. Its totient is φ = 59909929728.

The previous prime is 121656163609. The next prime is 121656163631. The reversal of 121656163612 is 216361656121.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

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, 1666878 + ... + 1738330.

It is an arithmetic number, because the mean of its divisors is an integer number (9004704534).

Almost surely, 2^121656163612 is an apocalyptic number.

It is an amenable number.

121656163612 is a deficient number, since it is larger than the sum of its proper divisors (94456745204).

121656163612 is a wasteful number, since it uses less digits than its factorization.

121656163612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77877 (or 77875 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The spelling of 121656163612 in words is "one hundred twenty-one billion, six hundred fifty-six million, one hundred sixty-three thousand, six hundred twelve".