15116220661 has 2 divisors, whose sum is σ = 15116220662. Its totient is φ = 15116220660.

The previous prime is 15116220653. The next prime is 15116220677. The reversal of 15116220661 is 16602261151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15062652900 + 53567761 = 122730^2 + 7319^2 .

It is a cyclic number.

It is not a de Polignac number, because 15116220661 - 2³ = 15116220653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15116220761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7558110330 + 7558110331.

It is an arithmetic number, because the mean of its divisors is an integer number (7558110331).

Almost surely, 2^15116220661 is an apocalyptic number.

It is an amenable number.

15116220661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15116220661 is an equidigital number, since it uses as much as digits as its factorization.

15116220661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 15116220661 in words is "fifteen billion, one hundred sixteen million, two hundred twenty thousand, six hundred sixty-one".