7715423635921 has 16 divisors (see below), whose sum is σ = 7955473695568. Its totient is φ = 7477090560000.

The previous prime is 7715423635889. The next prime is 7715423635937. The reversal of 7715423635921 is 1295363245177.

It can be written as a sum of positive squares in 8 ways, for example, as 275016336400 + 7440407299521 = 524420^2 + 2727711^2 .

It is a cyclic number.

It is not a de Polignac number, because 7715423635921 - 2⁵ = 7715423635889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7715493635921) 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 15 ways as a sum of consecutive naturals, for example, 9227971 + ... + 10029271.

It is an arithmetic number, because the mean of its divisors is an integer number (497217105973).

Almost surely, 2^{7715423635921} is an apocalyptic number.

It is an amenable number.

7715423635921 is a deficient number, since it is larger than the sum of its proper divisors (240050059647).

7715423635921 is a wasteful number, since it uses less digits than its factorization.

7715423635921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802372.

The product of its digits is 9525600, while the sum is 55.

The spelling of 7715423635921 in words is "seven trillion, seven hundred fifteen billion, four hundred twenty-three million, six hundred thirty-five thousand, nine hundred twenty-one".