121662656361 has 12 divisors (see below), whose sum is σ = 175753943040. Its totient is φ = 81099670680.

The previous prime is 121662656359. The next prime is 121662656369. The reversal of 121662656361 is 163656266121.

121662656361 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 6 + 2 + 6 + 5 + 636 + 1 = 666.

It is not a de Polignac number, because 121662656361 - 2¹ = 121662656359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121662656369) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 642121 + ... + 809718.

It is an arithmetic number, because the mean of its divisors is an integer number (14646161920).

Almost surely, 2^121662656361 is an apocalyptic number.

It is an amenable number.

121662656361 is a deficient number, since it is larger than the sum of its proper divisors (54091286679).

121662656361 is a wasteful number, since it uses less digits than its factorization.

121662656361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461156 (or 1461153 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 121662656361 in words is "one hundred twenty-one billion, six hundred sixty-two million, six hundred fifty-six thousand, three hundred sixty-one".