121687791544 has 64 divisors (see below), whose sum is σ = 250679484000. Its totient is φ = 54920056320.

The previous prime is 121687791541. The next prime is 121687791553. The reversal of 121687791544 is 445197786121.

It is a super-2 number, since 2×121687791544² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121687791541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7508602 + ... + 7524790.

Almost surely, 2^121687791544 is an apocalyptic number.

It is an amenable number.

121687791544 is an abundant number, since it is smaller than the sum of its proper divisors (128991692456).

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

121687791544 is a wasteful number, since it uses less digits than its factorization.

121687791544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16808 (or 16804 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 55.

The spelling of 121687791544 in words is "one hundred twenty-one billion, six hundred eighty-seven million, seven hundred ninety-one thousand, five hundred forty-four".