25561347644 has 18 divisors (see below), whose sum is σ = 52035600960. Its totient is φ = 10954863192.

The previous prime is 25561347641. The next prime is 25561347659. The reversal of 25561347644 is 44674316552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561347641) 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, 65207324 + ... + 65207715.

It is an arithmetic number, because the mean of its divisors is an integer number (2890866720).

Almost surely, 2^25561347644 is an apocalyptic number.

It is an amenable number.

25561347644 is an abundant number, since it is smaller than the sum of its proper divisors (26474253316).

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

25561347644 is a wasteful number, since it uses less digits than its factorization.

25561347644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130415057 (or 130415048 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 47.

The spelling of 25561347644 in words is "twenty-five billion, five hundred sixty-one million, three hundred forty-seven thousand, six hundred forty-four".