187968640693 has 2 divisors, whose sum is σ = 187968640694. Its totient is φ = 187968640692.

The previous prime is 187968640687. The next prime is 187968640697. The reversal of 187968640693 is 396046869781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128896796484 + 59071844209 = 359022^2 + 243047^2 .

It is a cyclic number.

It is not a de Polignac number, because 187968640693 - 2⁵ = 187968640661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187968640697) 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, 93984320346 + 93984320347.

It is an arithmetic number, because the mean of its divisors is an integer number (93984320347).

Almost surely, 2^187968640693 is an apocalyptic number.

It is an amenable number.

187968640693 is a deficient number, since it is larger than the sum of its proper divisors (1).

187968640693 is an equidigital number, since it uses as much as digits as its factorization.

187968640693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94058496, while the sum is 67.

The spelling of 187968640693 in words is "one hundred eighty-seven billion, nine hundred sixty-eight million, six hundred forty thousand, six hundred ninety-three".