25813884890 has 16 divisors (see below), whose sum is σ = 46467387720. Its totient is φ = 10325021760.

The previous prime is 25813884749. The next prime is 25813884917. The reversal of 25813884890 is 9848831852.

It is a happy number.

It is a Cunningham number, because it is equal to 160667²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 22315280689 + 3498604201 = 149383^2 + 59149^2 .

It is a super-2 number, since 2×25813884890² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181076 + ... + 290544.

Almost surely, 2^25813884890 is an apocalyptic number.

25813884890 is a deficient number, since it is larger than the sum of its proper divisors (20653502830).

25813884890 is a wasteful number, since it uses less digits than its factorization.

25813884890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133057.

The product of its (nonzero) digits is 4423680, while the sum is 56.

The spelling of 25813884890 in words is "twenty-five billion, eight hundred thirteen million, eight hundred eighty-four thousand, eight hundred ninety".