18539124977 has 2 divisors, whose sum is σ = 18539124978. Its totient is φ = 18539124976.

The previous prime is 18539124917. The next prime is 18539124979. The reversal of 18539124977 is 77942193581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16857386896 + 1681738081 = 129836^2 + 41009^2 .

It is a cyclic number.

It is not a de Polignac number, because 18539124977 - 2³⁰ = 17465383153 is a prime.

Together with 18539124979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18539124979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9269562488 + 9269562489.

It is an arithmetic number, because the mean of its divisors is an integer number (9269562489).

Almost surely, 2^18539124977 is an apocalyptic number.

It is an amenable number.

18539124977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18539124977 is an equidigital number, since it uses as much as digits as its factorization.

18539124977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 56.

The spelling of 18539124977 in words is "eighteen billion, five hundred thirty-nine million, one hundred twenty-four thousand, nine hundred seventy-seven".