18936278497 has 2 divisors, whose sum is σ = 18936278498. Its totient is φ = 18936278496.

The previous prime is 18936278489. The next prime is 18936278519. The reversal of 18936278497 is 79487263981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18936236881 + 41616 = 137609^2 + 204^2 .

It is a cyclic number.

It is not a de Polignac number, because 18936278497 - 2³ = 18936278489 is a prime.

It is not a weakly prime, because it can be changed into another prime (18936278447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9468139248 + 9468139249.

It is an arithmetic number, because the mean of its divisors is an integer number (9468139249).

Almost surely, 2^18936278497 is an apocalyptic number.

It is an amenable number.

18936278497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18936278497 is an equidigital number, since it uses as much as digits as its factorization.

18936278497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 64.

The spelling of 18936278497 in words is "eighteen billion, nine hundred thirty-six million, two hundred seventy-eight thousand, four hundred ninety-seven".