188994378757 has 2 divisors, whose sum is σ = 188994378758. Its totient is φ = 188994378756.

The previous prime is 188994378733. The next prime is 188994378763. The reversal of 188994378757 is 757873499881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100637410756 + 88356968001 = 317234^2 + 297249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188994378757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188994378787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94497189378 + 94497189379.

It is an arithmetic number, because the mean of its divisors is an integer number (94497189379).

Almost surely, 2^188994378757 is an apocalyptic number.

It is an amenable number.

188994378757 is a deficient number, since it is larger than the sum of its proper divisors (1).

188994378757 is an equidigital number, since it uses as much as digits as its factorization.

188994378757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 853493760, while the sum is 76.

The spelling of 188994378757 in words is "one hundred eighty-eight billion, nine hundred ninety-four million, three hundred seventy-eight thousand, seven hundred fifty-seven".