7990312661 has 2 divisors, whose sum is σ = 7990312662. Its totient is φ = 7990312660.

The previous prime is 7990312619. The next prime is 7990312663. The reversal of 7990312661 is 1662130997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4069674436 + 3920638225 = 63794^2 + 62615^2 .

It is a cyclic number.

It is not a de Polignac number, because 7990312661 - 2¹⁸ = 7990050517 is a prime.

Together with 7990312663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7990312663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995156330 + 3995156331.

It is an arithmetic number, because the mean of its divisors is an integer number (3995156331).

Almost surely, 2^7990312661 is an apocalyptic number.

It is an amenable number.

7990312661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7990312661 is an equidigital number, since it uses as much as digits as its factorization.

7990312661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 7990312661 is about 89388.5488247796. The cubic root of 7990312661 is about 1999.1923956815.

The spelling of 7990312661 in words is "seven billion, nine hundred ninety million, three hundred twelve thousand, six hundred sixty-one".