25187699640 has 64 divisors (see below), whose sum is σ = 78000629760. Its totient is φ = 6500050560.

The previous prime is 25187699633. The next prime is 25187699659. The reversal of 25187699640 is 4699678152.

It is a super-3 number, since 3×25187699640³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3381724 + ... + 3389163.

It is an arithmetic number, because the mean of its divisors is an integer number (1218759840).

Almost surely, 2^25187699640 is an apocalyptic number.

25187699640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25187699640 is an abundant number, since it is smaller than the sum of its proper divisors (52812930120).

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

25187699640 is a wasteful number, since it uses less digits than its factorization.

25187699640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770932 (or 6770928 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 25187699640 in words is "twenty-five billion, one hundred eighty-seven million, six hundred ninety-nine thousand, six hundred forty".