25306607540 has 12 divisors (see below), whose sum is σ = 53143875876. Its totient is φ = 10122643008.

The previous prime is 25306607539. The next prime is 25306607563. The reversal of 25306607540 is 4570660352.

It can be written as a sum of positive squares in 2 ways, for example, as 11125608484 + 14180999056 = 105478^2 + 119084^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25306607494 and 25306607503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632665169 + ... + 632665208.

It is an arithmetic number, because the mean of its divisors is an integer number (4428656323).

Almost surely, 2^25306607540 is an apocalyptic number.

25306607540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25306607540 is an abundant number, since it is smaller than the sum of its proper divisors (27837268336).

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

25306607540 is a wasteful number, since it uses less digits than its factorization.

25306607540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265330386 (or 1265330384 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

The spelling of 25306607540 in words is "twenty-five billion, three hundred six million, six hundred seven thousand, five hundred forty".