25161474768 has 80 divisors (see below), whose sum is σ = 66619069440. Its totient is φ = 8178936192.

The previous prime is 25161474763. The next prime is 25161474791. The reversal of 25161474768 is 86747416152.

It is a self number, because there is not a number n which added to its sum of digits gives 25161474768.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25161474761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1317673 + ... + 1336631.

It is an arithmetic number, because the mean of its divisors is an integer number (832738368).

Almost surely, 2^25161474768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25161474768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33309534720).

25161474768 is an abundant number, since it is smaller than the sum of its proper divisors (41457594672).

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

25161474768 is a wasteful number, since it uses less digits than its factorization.

25161474768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19656 (or 19650 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The spelling of 25161474768 in words is "twenty-five billion, one hundred sixty-one million, four hundred seventy-four thousand, seven hundred sixty-eight".