25640335875 has 128 divisors (see below), whose sum is σ = 54069110784. Its totient is φ = 10480320000.

The previous prime is 25640335873. The next prime is 25640335909. The reversal of 25640335875 is 57853304652.

It is a happy number.

It is a Cunningham number, because it is equal to 160126²-1.

It is not a de Polignac number, because 25640335875 - 2¹ = 25640335873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25640335873) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1754097 + ... + 1768653.

It is an arithmetic number, because the mean of its divisors is an integer number (422414928).

Almost surely, 2^25640335875 is an apocalyptic number.

25640335875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25640335875 is an abundant number, since it is smaller than the sum of its proper divisors (28428774909).

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

25640335875 is a wasteful number, since it uses less digits than its factorization.

25640335875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14654 (or 14644 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 48.

The spelling of 25640335875 in words is "twenty-five billion, six hundred forty million, three hundred thirty-five thousand, eight hundred seventy-five".