25138540660 has 24 divisors (see below), whose sum is σ = 52899356160. Its totient is φ = 10034764704.

The previous prime is 25138540639. The next prime is 25138540681. The reversal of 25138540660 is 6604583152.

It is an interprime number because it is at equal distance from previous prime (25138540639) and next prime (25138540681).

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, 1280740 + ... + 1300219.

It is an arithmetic number, because the mean of its divisors is an integer number (2204139840).

Almost surely, 2^25138540660 is an apocalyptic number.

25138540660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25138540660 is an abundant number, since it is smaller than the sum of its proper divisors (27760815500).

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

25138540660 is a wasteful number, since it uses less digits than its factorization.

25138540660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581455 (or 2581453 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 25138540660 in words is "twenty-five billion, one hundred thirty-eight million, five hundred forty thousand, six hundred sixty".