188808975517 has 2 divisors, whose sum is σ = 188808975518. Its totient is φ = 188808975516.

The previous prime is 188808975473. The next prime is 188808975521. The reversal of 188808975517 is 715579808881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177130715161 + 11678260356 = 420869^2 + 108066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188808975517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188808979517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94404487758 + 94404487759.

It is an arithmetic number, because the mean of its divisors is an integer number (94404487759).

Almost surely, 2^188808975517 is an apocalyptic number.

It is an amenable number.

188808975517 is a deficient number, since it is larger than the sum of its proper divisors (1).

188808975517 is an equidigital number, since it uses as much as digits as its factorization.

188808975517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45158400, while the sum is 67.

The spelling of 188808975517 in words is "one hundred eighty-eight billion, eight hundred eight million, nine hundred seventy-five thousand, five hundred seventeen".