121157162775 has 96 divisors (see below), whose sum is σ = 243636906240. Its totient is φ = 58541328000.

The previous prime is 121157162773. The next prime is 121157162779. The reversal of 121157162775 is 577261751121.

121157162775 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 571 + 6 + 2 + 7 + 75 = 666.

It is not a de Polignac number, because 121157162775 - 2¹ = 121157162773 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121157162775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121157162773) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2147680 + ... + 2203370.

It is an arithmetic number, because the mean of its divisors is an integer number (2537884440).

Almost surely, 2^121157162775 is an apocalyptic number.

121157162775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121157162775 is an abundant number, since it is smaller than the sum of its proper divisors (122479743465).

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

121157162775 is a wasteful number, since it uses less digits than its factorization.

121157162775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56014 (or 56003 counting only the distinct ones).

The product of its digits is 205800, while the sum is 45.

The spelling of 121157162775 in words is "one hundred twenty-one billion, one hundred fifty-seven million, one hundred sixty-two thousand, seven hundred seventy-five".