25947648309 has 32 divisors (see below), whose sum is σ = 38146048128. Its totient is φ = 15557760000.

The previous prime is 25947648299. The next prime is 25947648323. The reversal of 25947648309 is 90384674952.

It is not a de Polignac number, because 25947648309 - 2¹⁷ = 25947517237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25947448309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5840529 + ... + 5844969.

It is an arithmetic number, because the mean of its divisors is an integer number (1192064004).

Almost surely, 2^25947648309 is an apocalyptic number.

It is an amenable number.

25947648309 is a deficient number, since it is larger than the sum of its proper divisors (12198399819).

25947648309 is a wasteful number, since it uses less digits than its factorization.

25947648309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6309.

The product of its (nonzero) digits is 13063680, while the sum is 57.

The spelling of 25947648309 in words is "twenty-five billion, nine hundred forty-seven million, six hundred forty-eight thousand, three hundred nine".