188191806457 has 2 divisors, whose sum is σ = 188191806458. Its totient is φ = 188191806456.

The previous prime is 188191806427. The next prime is 188191806493. The reversal of 188191806457 is 754608191881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161113129321 + 27078677136 = 401389^2 + 164556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188191806457 is a prime.

It is not a weakly prime, because it can be changed into another prime (188191806427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94095903228 + 94095903229.

It is an arithmetic number, because the mean of its divisors is an integer number (94095903229).

Almost surely, 2^188191806457 is an apocalyptic number.

It is an amenable number.

188191806457 is a deficient number, since it is larger than the sum of its proper divisors (1).

188191806457 is an equidigital number, since it uses as much as digits as its factorization.

188191806457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 58.

The spelling of 188191806457 in words is "one hundred eighty-eight billion, one hundred ninety-one million, eight hundred six thousand, four hundred fifty-seven".