25651782138 has 16 divisors (see below), whose sum is σ = 51318030240. Its totient is φ = 8548183056.

The previous prime is 25651782127. The next prime is 25651782151. The reversal of 25651782138 is 83128715652.

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, 579628 + ... + 622311.

It is an arithmetic number, because the mean of its divisors is an integer number (3207376890).

Almost surely, 2^25651782138 is an apocalyptic number.

25651782138 is an abundant number, since it is smaller than the sum of its proper divisors (25666248102).

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

25651782138 is a wasteful number, since it uses less digits than its factorization.

25651782138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205501.

The product of its digits is 806400, while the sum is 48.

The spelling of 25651782138 in words is "twenty-five billion, six hundred fifty-one million, seven hundred eighty-two thousand, one hundred thirty-eight".