188430930257 has 2 divisors, whose sum is σ = 188430930258. Its totient is φ = 188430930256.

The previous prime is 188430930253. The next prime is 188430930349. The reversal of 188430930257 is 752039034881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169065702976 + 19365227281 = 411176^2 + 139159^2 .

It is an emirp because it is prime and its reverse (752039034881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 188430930257 - 2² = 188430930253 is a prime.

It is not a weakly prime, because it can be changed into another prime (188430930253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94215465128 + 94215465129.

It is an arithmetic number, because the mean of its divisors is an integer number (94215465129).

Almost surely, 2^188430930257 is an apocalyptic number.

It is an amenable number.

188430930257 is a deficient number, since it is larger than the sum of its proper divisors (1).

188430930257 is an equidigital number, since it uses as much as digits as its factorization.

188430930257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 188430930257 in words is "one hundred eighty-eight billion, four hundred thirty million, nine hundred thirty thousand, two hundred fifty-seven".