7990564157 has 2 divisors, whose sum is σ = 7990564158. Its totient is φ = 7990564156.

The previous prime is 7990564129. The next prime is 7990564181. The reversal of 7990564157 is 7514650997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7294184836 + 696379321 = 85406^2 + 26389^2 .

It is a cyclic number.

It is not a de Polignac number, because 7990564157 - 2²⁴ = 7973786941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7990564099 and 7990564108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7990564357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995282078 + 3995282079.

It is an arithmetic number, because the mean of its divisors is an integer number (3995282079).

Almost surely, 2^7990564157 is an apocalyptic number.

It is an amenable number.

7990564157 is a deficient number, since it is larger than the sum of its proper divisors (1).

7990564157 is an equidigital number, since it uses as much as digits as its factorization.

7990564157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2381400, while the sum is 53.

The square root of 7990564157 is about 89389.9555710819. The cubic root of 7990564157 is about 1999.2133703975.

The spelling of 7990564157 in words is "seven billion, nine hundred ninety million, five hundred sixty-four thousand, one hundred fifty-seven".