25815891480 has 64 divisors (see below), whose sum is σ = 77518287360. Its totient is φ = 6877961088.

The previous prime is 25815891457. The next prime is 25815891547. The reversal of 25815891480 is 8419851852.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34839 + ... + 229881.

It is an arithmetic number, because the mean of its divisors is an integer number (1211223240).

Almost surely, 2^25815891480 is an apocalyptic number.

25815891480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25815891480 is an abundant number, since it is smaller than the sum of its proper divisors (51702395880).

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

25815891480 is a wasteful number, since it uses less digits than its factorization.

25815891480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196160 (or 196156 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 51.

The spelling of 25815891480 in words is "twenty-five billion, eight hundred fifteen million, eight hundred ninety-one thousand, four hundred eighty".