187993172399 has 2 divisors, whose sum is σ = 187993172400. Its totient is φ = 187993172398.

The previous prime is 187993172333. The next prime is 187993172429. The reversal of 187993172399 is 993271399781.

187993172399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 187993172399 - 2¹² = 187993168303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187993172299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93996586199 + 93996586200.

It is an arithmetic number, because the mean of its divisors is an integer number (93996586200).

Almost surely, 2^187993172399 is an apocalyptic number.

187993172399 is a deficient number, since it is larger than the sum of its proper divisors (1).

187993172399 is an equidigital number, since it uses as much as digits as its factorization.

187993172399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 68.

The spelling of 187993172399 in words is "one hundred eighty-seven billion, nine hundred ninety-three million, one hundred seventy-two thousand, three hundred ninety-nine".