75979637721 has 24 divisors (see below), whose sum is σ = 118208825280. Its totient is φ = 46749469536.

The previous prime is 75979637689. The next prime is 75979637731. The reversal of 75979637721 is 12773697957.

75979637721 is a `hidden beast` number, since 7 + 597 + 9 + 6 + 37 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 75979637721 - 2⁵ = 75979637689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75979637731) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 766060 + ... + 859538.

It is an arithmetic number, because the mean of its divisors is an integer number (4925367720).

Almost surely, 2^75979637721 is an apocalyptic number.

It is an amenable number.

75979637721 is a deficient number, since it is larger than the sum of its proper divisors (42229187559).

75979637721 is a wasteful number, since it uses less digits than its factorization.

75979637721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100445 (or 100442 counting only the distinct ones).

The product of its digits is 35006580, while the sum is 63.

The spelling of 75979637721 in words is "seventy-five billion, nine hundred seventy-nine million, six hundred thirty-seven thousand, seven hundred twenty-one".