25642139432 has 256 divisors, whose sum is σ = 62905920000. Its totient is φ = 9729828864.

The previous prime is 25642139429. The next prime is 25642139461. The reversal of 25642139432 is 23493124652.

It is a self number, because there is not a number n which added to its sum of digits gives 25642139432.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 111974294 + ... + 111974522.

It is an arithmetic number, because the mean of its divisors is an integer number (245726250).

Almost surely, 2^25642139432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25642139432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31452960000).

25642139432 is an abundant number, since it is smaller than the sum of its proper divisors (37263780568).

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

25642139432 is a wasteful number, since it uses less digits than its factorization.

25642139432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 367 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The spelling of 25642139432 in words is "twenty-five billion, six hundred forty-two million, one hundred thirty-nine thousand, four hundred thirty-two".