18979630577 has 2 divisors, whose sum is σ = 18979630578. Its totient is φ = 18979630576.

The previous prime is 18979630529. The next prime is 18979630583. The reversal of 18979630577 is 77503697981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12961594801 + 6018035776 = 113849^2 + 77576^2 .

It is a cyclic number.

It is not a de Polignac number, because 18979630577 - 2⁸ = 18979630321 is a prime.

It is not a weakly prime, because it can be changed into another prime (18979630507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489815288 + 9489815289.

It is an arithmetic number, because the mean of its divisors is an integer number (9489815289).

Almost surely, 2^18979630577 is an apocalyptic number.

It is an amenable number.

18979630577 is a deficient number, since it is larger than the sum of its proper divisors (1).

18979630577 is an equidigital number, since it uses as much as digits as its factorization.

18979630577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20003760, while the sum is 62.

The spelling of 18979630577 in words is "eighteen billion, nine hundred seventy-nine million, six hundred thirty thousand, five hundred seventy-seven".