121079765865 has 32 divisors (see below), whose sum is σ = 196595755776. Its totient is φ = 63621125120.

The previous prime is 121079765803. The next prime is 121079765899. The reversal of 121079765865 is 568567970121.

It is not a de Polignac number, because 121079765865 - 2¹¹ = 121079763817 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1486477 + ... + 1565813.

It is an arithmetic number, because the mean of its divisors is an integer number (6143617368).

Almost surely, 2^121079765865 is an apocalyptic number.

121079765865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121079765865 is a deficient number, since it is larger than the sum of its proper divisors (75515989911).

121079765865 is a wasteful number, since it uses less digits than its factorization.

121079765865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80849.

The product of its (nonzero) digits is 6350400, while the sum is 57.

The spelling of 121079765865 in words is "one hundred twenty-one billion, seventy-nine million, seven hundred sixty-five thousand, eight hundred sixty-five".