75979725121 has 4 divisors (see below), whose sum is σ = 75992734512. Its totient is φ = 75966715732.

The previous prime is 75979725097. The next prime is 75979725127. The reversal of 75979725121 is 12152797957.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75979725121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75979725127) by changing a digit.

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, 6495931 + ... + 6507616.

It is an arithmetic number, because the mean of its divisors is an integer number (18998183628).

Almost surely, 2^75979725121 is an apocalyptic number.

It is an amenable number.

75979725121 is a deficient number, since it is larger than the sum of its proper divisors (13009391).

75979725121 is a wasteful number, since it uses less digits than its factorization.

75979725121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13009390.

The product of its digits is 2778300, while the sum is 55.

The spelling of 75979725121 in words is "seventy-five billion, nine hundred seventy-nine million, seven hundred twenty-five thousand, one hundred twenty-one".