18245291957 has 2 divisors, whose sum is σ = 18245291958. Its totient is φ = 18245291956.

The previous prime is 18245291887. The next prime is 18245291969. The reversal of 18245291957 is 75919254281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16468332241 + 1776959716 = 128329^2 + 42154^2 .

It is a cyclic number.

It is not a de Polignac number, because 18245291957 - 2²² = 18241097653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18245291899 and 18245291908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18245290957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9122645978 + 9122645979.

It is an arithmetic number, because the mean of its divisors is an integer number (9122645979).

Almost surely, 2^18245291957 is an apocalyptic number.

It is an amenable number.

18245291957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18245291957 is an equidigital number, since it uses as much as digits as its factorization.

18245291957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 53.

The spelling of 18245291957 in words is "eighteen billion, two hundred forty-five million, two hundred ninety-one thousand, nine hundred fifty-seven".