18868623913 has 2 divisors, whose sum is σ = 18868623914. Its totient is φ = 18868623912.

The previous prime is 18868623877. The next prime is 18868623923. The reversal of 18868623913 is 31932686881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18865571904 + 3052009 = 137352^2 + 1747^2 .

It is an emirp because it is prime and its reverse (31932686881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18868623913 is a prime.

It is not a weakly prime, because it can be changed into another prime (18868623923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434311956 + 9434311957.

It is an arithmetic number, because the mean of its divisors is an integer number (9434311957).

Almost surely, 2^18868623913 is an apocalyptic number.

It is an amenable number.

18868623913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18868623913 is an equidigital number, since it uses as much as digits as its factorization.

18868623913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 55.

The spelling of 18868623913 in words is "eighteen billion, eight hundred sixty-eight million, six hundred twenty-three thousand, nine hundred thirteen".