121116402565 has 4 divisors (see below), whose sum is σ = 145339683084. Its totient is φ = 96893122048.

The previous prime is 121116402553. The next prime is 121116402587. The reversal of 121116402565 is 565204611121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86239719556 + 34876683009 = 293666^2 + 186753^2 .

It is a cyclic number.

It is not a de Polignac number, because 121116402565 - 2²⁷ = 120982184837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121116402565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12111640252 + ... + 12111640261.

It is an arithmetic number, because the mean of its divisors is an integer number (36334920771).

Almost surely, 2^121116402565 is an apocalyptic number.

It is an amenable number.

121116402565 is a deficient number, since it is larger than the sum of its proper divisors (24223280519).

121116402565 is an equidigital number, since it uses as much as digits as its factorization.

121116402565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24223280518.

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 121116402565 in words is "one hundred twenty-one billion, one hundred sixteen million, four hundred two thousand, five hundred sixty-five".