25567280639 has 4 divisors (see below), whose sum is σ = 25661625120. Its totient is φ = 25472936160.

The previous prime is 25567280579. The next prime is 25567280653. The reversal of 25567280639 is 93608276552.

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 25567280639 - 2³² = 21272313343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25567280699) 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, 47171834 + ... + 47172375.

It is an arithmetic number, because the mean of its divisors is an integer number (6415406280).

Almost surely, 2^25567280639 is an apocalyptic number.

25567280639 is a deficient number, since it is larger than the sum of its proper divisors (94344481).

25567280639 is an equidigital number, since it uses as much as digits as its factorization.

25567280639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94344480.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 25567280639 in words is "twenty-five billion, five hundred sixty-seven million, two hundred eighty thousand, six hundred thirty-nine".