121635344465541 has 16 divisors (see below), whose sum is σ = 186013430008320. Its totient is φ = 78474415783680.

The previous prime is 121635344465491. The next prime is 121635344465567. The reversal of 121635344465541 is 145564443536121.

It is a happy number.

121635344465541 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 3 + 5 + 3 + 44 + 46 + 554 + 1 = 666.

It is not a de Polignac number, because 121635344465541 - 2⁶ = 121635344465477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121635344465941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72661495260 + ... + 72661496933.

It is an arithmetic number, because the mean of its divisors is an integer number (11625839375520).

Almost surely, 2^{121635344465541} is an apocalyptic number.

It is an amenable number.

121635344465541 is a deficient number, since it is larger than the sum of its proper divisors (64378085542779).

121635344465541 is a wasteful number, since it uses less digits than its factorization.

121635344465541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145322992233 (or 145322992227 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 54.

The spelling of 121635344465541 in words is "one hundred twenty-one trillion, six hundred thirty-five billion, three hundred forty-four million, four hundred sixty-five thousand, five hundred forty-one".