188691868609 has 2 divisors, whose sum is σ = 188691868610. Its totient is φ = 188691868608.

The previous prime is 188691868597. The next prime is 188691868711. The reversal of 188691868609 is 906868196881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153057000625 + 35634867984 = 391225^2 + 188772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188691868609 is a prime.

It is a super-2 number, since 2×188691868609² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (188691863609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94345934304 + 94345934305.

It is an arithmetic number, because the mean of its divisors is an integer number (94345934305).

Almost surely, 2^188691868609 is an apocalyptic number.

It is an amenable number.

188691868609 is a deficient number, since it is larger than the sum of its proper divisors (1).

188691868609 is an equidigital number, since it uses as much as digits as its factorization.

188691868609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71663616, while the sum is 70.

The spelling of 188691868609 in words is "one hundred eighty-eight billion, six hundred ninety-one million, eight hundred sixty-eight thousand, six hundred nine".