25540478460 has 144 divisors (see below), whose sum is σ = 90211133376. Its totient is φ = 5727661056.

The previous prime is 25540478413. The next prime is 25540478461. The reversal of 25540478460 is 6487404552.

25540478460 is a `hidden beast` number, since 2 + 5 + 540 + 47 + 8 + 4 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25540478461) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124449 + ... + 258008.

It is an arithmetic number, because the mean of its divisors is an integer number (626466204).

Almost surely, 2^25540478460 is an apocalyptic number.

25540478460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25540478460 is an abundant number, since it is smaller than the sum of its proper divisors (64670654916).

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

25540478460 is a wasteful number, since it uses less digits than its factorization.

25540478460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382532 (or 382527 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 45.

The spelling of 25540478460 in words is "twenty-five billion, five hundred forty million, four hundred seventy-eight thousand, four hundred sixty".