25990705871 has 6 divisors (see below), whose sum is σ = 28143782280. Its totient is φ = 23991420648.

The previous prime is 25990705831. The next prime is 25990705889. The reversal of 25990705871 is 17850709952.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-25990705871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25990705831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76895411 + ... + 76895748.

It is an arithmetic number, because the mean of its divisors is an integer number (4690630380).

Almost surely, 2^25990705871 is an apocalyptic number.

25990705871 is a deficient number, since it is larger than the sum of its proper divisors (2153076409).

25990705871 is a wasteful number, since it uses less digits than its factorization.

25990705871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153791185 (or 153791172 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 53.

The spelling of 25990705871 in words is "twenty-five billion, nine hundred ninety million, seven hundred five thousand, eight hundred seventy-one".