18317533957 has 2 divisors, whose sum is σ = 18317533958. Its totient is φ = 18317533956.

The previous prime is 18317533933. The next prime is 18317533981. The reversal of 18317533957 is 75933571381.

It is a balanced prime because it is at equal distance from previous prime (18317533933) and next prime (18317533981).

It can be written as a sum of positive squares in only one way, i.e., 15848040321 + 2469493636 = 125889^2 + 49694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18317533957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18317534957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158766978 + 9158766979.

It is an arithmetic number, because the mean of its divisors is an integer number (9158766979).

Almost surely, 2^18317533957 is an apocalyptic number.

It is an amenable number.

18317533957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18317533957 is an equidigital number, since it uses as much as digits as its factorization.

18317533957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2381400, while the sum is 52.

The spelling of 18317533957 in words is "eighteen billion, three hundred seventeen million, five hundred thirty-three thousand, nine hundred fifty-seven".