7475265721 has 64 divisors (see below), whose sum is σ = 10117509120. Its totient is φ = 5345280000.

The previous prime is 7475265713. The next prime is 7475265737. The reversal of 7475265721 is 1275625747.

7475265721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 7475265721 - 2³ = 7475265713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7475265751) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11661561 + ... + 11662201.

It is an arithmetic number, because the mean of its divisors is an integer number (158086080).

Almost surely, 2^7475265721 is an apocalyptic number.

It is an amenable number.

7475265721 is a deficient number, since it is larger than the sum of its proper divisors (2642243399).

7475265721 is a wasteful number, since it uses less digits than its factorization.

7475265721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886.

The product of its digits is 823200, while the sum is 46.

The square root of 7475265721 is about 86459.6190195169. The cubic root of 7475265721 is about 1955.2796412320.

The spelling of 7475265721 in words is "seven billion, four hundred seventy-five million, two hundred sixty-five thousand, seven hundred twenty-one".