121565642424765 has 128 divisors (see below), whose sum is σ = 247228053811200. Its totient is φ = 49536907530240.

The previous prime is 121565642424757. The next prime is 121565642424817. The reversal of 121565642424765 is 567424246565121.

It is not a de Polignac number, because 121565642424765 - 2³ = 121565642424757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121565642424699 and 121565642424708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 98493781 + ... + 99720389.

It is an arithmetic number, because the mean of its divisors is an integer number (1931469170400).

Almost surely, 2^{121565642424765} is an apocalyptic number.

121565642424765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121565642424765 is an abundant number, since it is smaller than the sum of its proper divisors (125662411386435).

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

121565642424765 is a wasteful number, since it uses less digits than its factorization.

121565642424765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228307.

The product of its digits is 96768000, while the sum is 60.

Adding to 121565642424765 its reverse (567424246565121), we get a palindrome (688989888989886).

The spelling of 121565642424765 in words is "one hundred twenty-one trillion, five hundred sixty-five billion, six hundred forty-two million, four hundred twenty-four thousand, seven hundred sixty-five".