25644118902139 has 4 divisors (see below), whose sum is σ = 25778381304960. Its totient is φ = 25509856499320.

The previous prime is 25644118902137. The next prime is 25644118902163. The reversal of 25644118902139 is 93120981144652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25644118902139 - 2¹ = 25644118902137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25644118902139.

It is not an unprimeable number, because it can be changed into a prime (25644118902137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67131201124 + ... + 67131201505.

It is an arithmetic number, because the mean of its divisors is an integer number (6444595326240).

Almost surely, 2^{25644118902139} is an apocalyptic number.

25644118902139 is a deficient number, since it is larger than the sum of its proper divisors (134262402821).

25644118902139 is a wasteful number, since it uses less digits than its factorization.

25644118902139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134262402820.

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 25644118902139 in words is "twenty-five trillion, six hundred forty-four billion, one hundred eighteen million, nine hundred two thousand, one hundred thirty-nine".