7925421613 has 2 divisors, whose sum is σ = 7925421614. Its totient is φ = 7925421612.

The previous prime is 7925421593. The next prime is 7925421619. The reversal of 7925421613 is 3161245297.

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., 7000166889 + 925254724 = 83667^2 + 30418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7925421613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7925421619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3962710806 + 3962710807.

It is an arithmetic number, because the mean of its divisors is an integer number (3962710807).

Almost surely, 2^7925421613 is an apocalyptic number.

It is an amenable number.

7925421613 is a deficient number, since it is larger than the sum of its proper divisors (1).

7925421613 is an equidigital number, since it uses as much as digits as its factorization.

7925421613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 7925421613 is about 89024.8370568573. The cubic root of 7925421613 is about 1993.7657214943.

The spelling of 7925421613 in words is "seven billion, nine hundred twenty-five million, four hundred twenty-one thousand, six hundred thirteen".