18915361279 has 2 divisors, whose sum is σ = 18915361280. Its totient is φ = 18915361278.

The previous prime is 18915361247. The next prime is 18915361291. The reversal of 18915361279 is 97216351981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18915361279 - 2⁵ = 18915361247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18915361079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457680639 + 9457680640.

It is an arithmetic number, because the mean of its divisors is an integer number (9457680640).

Almost surely, 2^18915361279 is an apocalyptic number.

18915361279 is a deficient number, since it is larger than the sum of its proper divisors (1).

18915361279 is an equidigital number, since it uses as much as digits as its factorization.

18915361279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The spelling of 18915361279 in words is "eighteen billion, nine hundred fifteen million, three hundred sixty-one thousand, two hundred seventy-nine".