18318823277 has 2 divisors, whose sum is σ = 18318823278. Its totient is φ = 18318823276.

The previous prime is 18318823261. The next prime is 18318823283. The reversal of 18318823277 is 77232881381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15125556196 + 3193267081 = 122986^2 + 56509^2 .

It is a cyclic number.

It is not a de Polignac number, because 18318823277 - 2⁴ = 18318823261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18318823207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9159411638 + 9159411639.

It is an arithmetic number, because the mean of its divisors is an integer number (9159411639).

Almost surely, 2^18318823277 is an apocalyptic number.

It is an amenable number.

18318823277 is a deficient number, since it is larger than the sum of its proper divisors (1).

18318823277 is an equidigital number, since it uses as much as digits as its factorization.

18318823277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 50.

The spelling of 18318823277 in words is "eighteen billion, three hundred eighteen million, eight hundred twenty-three thousand, two hundred seventy-seven".