25669439664 has 160 divisors (see below), whose sum is σ = 73606717440. Its totient is φ = 7643500800.

The previous prime is 25669439657. The next prime is 25669439693. The reversal of 25669439664 is 46693496652.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25669439598 and 25669439607.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9467269 + ... + 9469979.

It is an arithmetic number, because the mean of its divisors is an integer number (460041984).

Almost surely, 2^25669439664 is an apocalyptic number.

25669439664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25669439664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36803358720).

25669439664 is an abundant number, since it is smaller than the sum of its proper divisors (47937277776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25669439664 is a wasteful number, since it uses less digits than its factorization.

25669439664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3039 (or 3033 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 60.

The spelling of 25669439664 in words is "twenty-five billion, six hundred sixty-nine million, four hundred thirty-nine thousand, six hundred sixty-four".