25506627540 has 24 divisors (see below), whose sum is σ = 71418557280. Its totient is φ = 6801767328.

The previous prime is 25506627533. The next prime is 25506627571. The reversal of 25506627540 is 4572660552.

It is a junction number, because it is equal to n+sod(n) for n = 25506627492 and 25506627501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212555170 + ... + 212555289.

It is an arithmetic number, because the mean of its divisors is an integer number (2975773220).

Almost surely, 2^25506627540 is an apocalyptic number.

25506627540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25506627540 is an abundant number, since it is smaller than the sum of its proper divisors (45911929740).

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

25506627540 is a wasteful number, since it uses less digits than its factorization.

25506627540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425110471 (or 425110469 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 42.

The spelling of 25506627540 in words is "twenty-five billion, five hundred six million, six hundred twenty-seven thousand, five hundred forty".