188000688661 has 2 divisors, whose sum is σ = 188000688662. Its totient is φ = 188000688660.

The previous prime is 188000688607. The next prime is 188000688679. The reversal of 188000688661 is 166886000881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127391172561 + 60609516100 = 356919^2 + 246190^2 .

It is an emirp because it is prime and its reverse (166886000881) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 199889000881 and 188000988991.

It is a cyclic number.

It is not a de Polignac number, because 188000688661 - 2¹⁵ = 188000655893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188000688599 and 188000688608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188000688361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94000344330 + 94000344331.

It is an arithmetic number, because the mean of its divisors is an integer number (94000344331).

Almost surely, 2^188000688661 is an apocalyptic number.

It is an amenable number.

188000688661 is a deficient number, since it is larger than the sum of its proper divisors (1).

188000688661 is an equidigital number, since it uses as much as digits as its factorization.

188000688661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 884736, while the sum is 52.

The spelling of 188000688661 in words is "one hundred eighty-eight billion, six hundred eighty-eight thousand, six hundred sixty-one".