18647560957 has 2 divisors, whose sum is σ = 18647560958. Its totient is φ = 18647560956.

The previous prime is 18647560949. The next prime is 18647560979. The reversal of 18647560957 is 75906574681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14129839161 + 4517721796 = 118869^2 + 67214^2 .

It is a cyclic number.

It is not a de Polignac number, because 18647560957 - 2³ = 18647560949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18647560927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9323780478 + 9323780479.

It is an arithmetic number, because the mean of its divisors is an integer number (9323780479).

Almost surely, 2^18647560957 is an apocalyptic number.

It is an amenable number.

18647560957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18647560957 is an equidigital number, since it uses as much as digits as its factorization.

18647560957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12700800, while the sum is 58.

The spelling of 18647560957 in words is "eighteen billion, six hundred forty-seven million, five hundred sixty thousand, nine hundred fifty-seven".