25719801187 has 2 divisors, whose sum is σ = 25719801188. Its totient is φ = 25719801186.

The previous prime is 25719801179. The next prime is 25719801253. The reversal of 25719801187 is 78110891752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25719801187 - 2³ = 25719801179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25719801187.

It is not a weakly prime, because it can be changed into another prime (25719801167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12859900593 + 12859900594.

It is an arithmetic number, because the mean of its divisors is an integer number (12859900594).

Almost surely, 2^25719801187 is an apocalyptic number.

25719801187 is a deficient number, since it is larger than the sum of its proper divisors (1).

25719801187 is an equidigital number, since it uses as much as digits as its factorization.

25719801187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 49.

The spelling of 25719801187 in words is "twenty-five billion, seven hundred nineteen million, eight hundred one thousand, one hundred eighty-seven".