25687402371 has 16 divisors (see below), whose sum is σ = 38345915520. Its totient is φ = 16994207880.

The previous prime is 25687402343. The next prime is 25687402399. The reversal of 25687402371 is 17320478652.

It is an interprime number because it is at equal distance from previous prime (25687402343) and next prime (25687402399).

It is not a de Polignac number, because 25687402371 - 2⁷ = 25687402243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25687482371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3627705 + ... + 3634778.

It is an arithmetic number, because the mean of its divisors is an integer number (2396619720).

Almost surely, 2^25687402371 is an apocalyptic number.

25687402371 is a deficient number, since it is larger than the sum of its proper divisors (12658513149).

25687402371 is a wasteful number, since it uses less digits than its factorization.

25687402371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7262623 (or 7262617 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 25687402371 in words is "twenty-five billion, six hundred eighty-seven million, four hundred two thousand, three hundred seventy-one".