25644156949 has 16 divisors (see below), whose sum is σ = 27632968000. Its totient is φ = 23719723776.

The previous prime is 25644156931. The next prime is 25644156971. The reversal of 25644156949 is 94965144652.

It is a cyclic number.

It is not a de Polignac number, because 25644156949 - 2⁹ = 25644156437 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 25644156949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25644150949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2652877 + ... + 2662525.

It is an arithmetic number, because the mean of its divisors is an integer number (1727060500).

Almost surely, 2^25644156949 is an apocalyptic number.

It is an amenable number.

25644156949 is a deficient number, since it is larger than the sum of its proper divisors (1988811051).

25644156949 is a wasteful number, since it uses less digits than its factorization.

25644156949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12964.

The product of its digits is 9331200, while the sum is 55.

The spelling of 25644156949 in words is "twenty-five billion, six hundred forty-four million, one hundred fifty-six thousand, nine hundred forty-nine".