25639594849 has 4 divisors (see below), whose sum is σ = 27970467120. Its totient is φ = 23308722580.

The previous prime is 25639594843. The next prime is 25639594867. The reversal of 25639594849 is 94849593652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25639594849 - 2⁵ = 25639594817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25639594843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1165436119 + ... + 1165436140.

It is an arithmetic number, because the mean of its divisors is an integer number (6992616780).

Almost surely, 2^25639594849 is an apocalyptic number.

It is an amenable number.

25639594849 is a deficient number, since it is larger than the sum of its proper divisors (2330872271).

25639594849 is a wasteful number, since it uses less digits than its factorization.

25639594849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330872270.

The product of its digits is 83980800, while the sum is 64.

The spelling of 25639594849 in words is "twenty-five billion, six hundred thirty-nine million, five hundred ninety-four thousand, eight hundred forty-nine".