25904981881 has 4 divisors (see below), whose sum is σ = 27268402000. Its totient is φ = 24541561764.

The previous prime is 25904981867. The next prime is 25904981891. The reversal of 25904981881 is 18818940952.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25904981881 - 2²³ = 25896593273 is a prime.

It is a super-2 number, since 2×25904981881² (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 (25904981801) 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, 681710031 + ... + 681710068.

It is an arithmetic number, because the mean of its divisors is an integer number (6817100500).

Almost surely, 2^25904981881 is an apocalyptic number.

It is an amenable number.

25904981881 is a deficient number, since it is larger than the sum of its proper divisors (1363420119).

25904981881 is a wasteful number, since it uses less digits than its factorization.

25904981881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363420118.

The product of its (nonzero) digits is 1658880, while the sum is 55.

The spelling of 25904981881 in words is "twenty-five billion, nine hundred four million, nine hundred eighty-one thousand, eight hundred eighty-one".