121637906460 has 144 divisors (see below), whose sum is σ = 423863783616. Its totient is φ = 27658838016.

The previous prime is 121637906437. The next prime is 121637906503. The reversal of 121637906460 is 64609736121.

121637906460 is a `hidden beast` number, since 1 + 2 + 1 + 637 + 9 + 0 + 6 + 4 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6919 + ... + 493278.

Almost surely, 2^121637906460 is an apocalyptic number.

121637906460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121637906460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211931891808).

121637906460 is an abundant number, since it is smaller than the sum of its proper divisors (302225877156).

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

121637906460 is a wasteful number, since it uses less digits than its factorization.

121637906460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500412 (or 500407 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 121637906460 in words is "one hundred twenty-one billion, six hundred thirty-seven million, nine hundred six thousand, four hundred sixty".