25544515540 has 24 divisors (see below), whose sum is σ = 53656398432. Its totient is φ = 10215346080.

The previous prime is 25544515519. The next prime is 25544515567. The reversal of 25544515540 is 4551544552.

It is a junction number, because it is equal to n+sod(n) for n = 25544515493 and 25544515502.

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, 67434 + ... + 235873.

It is an arithmetic number, because the mean of its divisors is an integer number (2235683268).

Almost surely, 2^25544515540 is an apocalyptic number.

25544515540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25544515540 is an abundant number, since it is smaller than the sum of its proper divisors (28111882892).

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

25544515540 is a wasteful number, since it uses less digits than its factorization.

25544515540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307527 (or 307525 counting only the distinct ones).

The product of its (nonzero) digits is 400000, while the sum is 40.

The spelling of 25544515540 in words is "twenty-five billion, five hundred forty-four million, five hundred fifteen thousand, five hundred forty".