188591849497 has 2 divisors, whose sum is σ = 188591849498. Its totient is φ = 188591849496.

The previous prime is 188591849483. The next prime is 188591849507. The reversal of 188591849497 is 794948195881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139987474201 + 48604375296 = 374149^2 + 220464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188591849497 is a prime.

It is not a weakly prime, because it can be changed into another prime (188591849297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94295924748 + 94295924749.

It is an arithmetic number, because the mean of its divisors is an integer number (94295924749).

Almost surely, 2^188591849497 is an apocalyptic number.

It is an amenable number.

188591849497 is a deficient number, since it is larger than the sum of its proper divisors (1).

188591849497 is an equidigital number, since it uses as much as digits as its factorization.

188591849497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209018880, while the sum is 73.

The spelling of 188591849497 in words is "one hundred eighty-eight billion, five hundred ninety-one million, eight hundred forty-nine thousand, four hundred ninety-seven".