18645952957 has 2 divisors, whose sum is σ = 18645952958. Its totient is φ = 18645952956.

The previous prime is 18645952909. The next prime is 18645952991. The reversal of 18645952957 is 75925954681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12289717881 + 6356235076 = 110859^2 + 79726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18645952957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18645952895 and 18645952904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18645992957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9322976478 + 9322976479.

It is an arithmetic number, because the mean of its divisors is an integer number (9322976479).

Almost surely, 2^18645952957 is an apocalyptic number.

It is an amenable number.

18645952957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18645952957 is an equidigital number, since it uses as much as digits as its factorization.

18645952957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216000, while the sum is 61.

The spelling of 18645952957 in words is "eighteen billion, six hundred forty-five million, nine hundred fifty-two thousand, nine hundred fifty-seven".