25919815480 has 64 divisors (see below), whose sum is σ = 64831737600. Its totient is φ = 9261665280.

The previous prime is 25919815417. The next prime is 25919815487. The reversal of 25919815480 is 8451891952.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25919815487) 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, 787845 + ... + 820084.

It is an arithmetic number, because the mean of its divisors is an integer number (1012995900).

Almost surely, 2^25919815480 is an apocalyptic number.

25919815480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25919815480 is an abundant number, since it is smaller than the sum of its proper divisors (38911922120).

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

25919815480 is a wasteful number, since it uses less digits than its factorization.

25919815480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607984 (or 1607980 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 52.

The spelling of 25919815480 in words is "twenty-five billion, nine hundred nineteen million, eight hundred fifteen thousand, four hundred eighty".