185213618657 has 2 divisors, whose sum is σ = 185213618658. Its totient is φ = 185213618656.

The previous prime is 185213618617. The next prime is 185213618701. The reversal of 185213618657 is 756816312581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178780134976 + 6433483681 = 422824^2 + 80209^2 .

It is a cyclic number.

It is not a de Polignac number, because 185213618657 - 2⁶ = 185213618593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 185213618599 and 185213618608.

It is not a weakly prime, because it can be changed into another prime (185213618617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92606809328 + 92606809329.

It is an arithmetic number, because the mean of its divisors is an integer number (92606809329).

Almost surely, 2^185213618657 is an apocalyptic number.

It is an amenable number.

185213618657 is a deficient number, since it is larger than the sum of its proper divisors (1).

185213618657 is an equidigital number, since it uses as much as digits as its factorization.

185213618657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 53.

The spelling of 185213618657 in words is "one hundred eighty-five billion, two hundred thirteen million, six hundred eighteen thousand, six hundred fifty-seven".