15677604661 has 2 divisors, whose sum is σ = 15677604662. Its totient is φ = 15677604660.

The previous prime is 15677604637. The next prime is 15677604703. The reversal of 15677604661 is 16640677651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14609556900 + 1068047761 = 120870^2 + 32681^2 .

It is a cyclic number.

It is not a de Polignac number, because 15677604661 - 2¹⁷ = 15677473589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15677604161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7838802330 + 7838802331.

It is an arithmetic number, because the mean of its divisors is an integer number (7838802331).

Almost surely, 2^15677604661 is an apocalyptic number.

It is an amenable number.

15677604661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15677604661 is an equidigital number, since it uses as much as digits as its factorization.

15677604661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 15677604661 in words is "fifteen billion, six hundred seventy-seven million, six hundred four thousand, six hundred sixty-one".