18310689977 has 2 divisors, whose sum is σ = 18310689978. Its totient is φ = 18310689976.

The previous prime is 18310689959. The next prime is 18310689983. The reversal of 18310689977 is 77998601381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16621397776 + 1689292201 = 128924^2 + 41101^2 .

It is a cyclic number.

It is not a de Polignac number, because 18310689977 - 2¹⁸ = 18310427833 is a prime.

It is not a weakly prime, because it can be changed into another prime (18310689377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9155344988 + 9155344989.

It is an arithmetic number, because the mean of its divisors is an integer number (9155344989).

Almost surely, 2^18310689977 is an apocalyptic number.

It is an amenable number.

18310689977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18310689977 is an equidigital number, since it uses as much as digits as its factorization.

18310689977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 59.

The spelling of 18310689977 in words is "eighteen billion, three hundred ten million, six hundred eighty-nine thousand, nine hundred seventy-seven".