25686451280 has 160 divisors (see below), whose sum is σ = 69893812224. Its totient is φ = 8596044288.

The previous prime is 25686451277. The next prime is 25686451289. The reversal of 25686451280 is 8215468652.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25686451289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11658659 + ... + 11660861.

Almost surely, 2^25686451280 is an apocalyptic number.

25686451280 is a gapful number since it is divisible by the number (20) 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 25686451280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34946906112).

25686451280 is an abundant number, since it is smaller than the sum of its proper divisors (44207360944).

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

25686451280 is a wasteful number, since it uses less digits than its factorization.

25686451280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 25686451280 in words is "twenty-five billion, six hundred eighty-six million, four hundred fifty-one thousand, two hundred eighty".