7990564181 has 2 divisors, whose sum is σ = 7990564182. Its totient is φ = 7990564180.

The previous prime is 7990564157. The next prime is 7990564189. The reversal of 7990564181 is 1814650997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7980742225 + 9821956 = 89335^2 + 3134^2 .

It is a cyclic number.

It is not a de Polignac number, because 7990564181 - 2³⁰ = 6916822357 is a prime.

It is a super-2 number, since 2×7990564181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7990564189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995282090 + 3995282091.

It is an arithmetic number, because the mean of its divisors is an integer number (3995282091).

Almost surely, 2^7990564181 is an apocalyptic number.

It is an amenable number.

7990564181 is a deficient number, since it is larger than the sum of its proper divisors (1).

7990564181 is an equidigital number, since it uses as much as digits as its factorization.

7990564181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 7990564181 is about 89389.9557053252. The cubic root of 7990564181 is about 1999.2133723991.

The spelling of 7990564181 in words is "seven billion, nine hundred ninety million, five hundred sixty-four thousand, one hundred eighty-one".