25259602891 has 4 divisors (see below), whose sum is σ = 25260980472. Its totient is φ = 25258225312.

The previous prime is 25259602871. The next prime is 25259602903. The reversal of 25259602891 is 19820695252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25259602891 - 2⁵ = 25259602859 is a prime.

It is a super-2 number, since 2×25259602891² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25259602811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660910 + ... + 698083.

It is an arithmetic number, because the mean of its divisors is an integer number (6315245118).

Almost surely, 2^25259602891 is an apocalyptic number.

25259602891 is a deficient number, since it is larger than the sum of its proper divisors (1377581).

25259602891 is a wasteful number, since it uses less digits than its factorization.

25259602891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377580.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 25259602891 in words is "twenty-five billion, two hundred fifty-nine million, six hundred two thousand, eight hundred ninety-one".