7372417565521 has 2 divisors, whose sum is σ = 7372417565522. Its totient is φ = 7372417565520.

The previous prime is 7372417565509. The next prime is 7372417565531. The reversal of 7372417565521 is 1255657142737.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7231258810000 + 141158755521 = 2689100^2 + 375711^2 .

It is a cyclic number.

It is not a de Polignac number, because 7372417565521 - 2⁷ = 7372417565393 is a prime.

It is not a weakly prime, because it can be changed into another prime (7372417565531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3686208782760 + 3686208782761.

It is an arithmetic number, because the mean of its divisors is an integer number (3686208782761).

Almost surely, 2^{7372417565521} is an apocalyptic number.

It is an amenable number.

7372417565521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7372417565521 is an equidigital number, since it uses as much as digits as its factorization.

7372417565521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12348000, while the sum is 55.

The spelling of 7372417565521 in words is "seven trillion, three hundred seventy-two billion, four hundred seventeen million, five hundred sixty-five thousand, five hundred twenty-one".