25561218746 has 64 divisors (see below), whose sum is σ = 45313551360. Its totient is φ = 10587801600.

The previous prime is 25561218703. The next prime is 25561218763. The reversal of 25561218746 is 64781216552.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25561218746.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42530846 + ... + 42531446.

It is an arithmetic number, because the mean of its divisors is an integer number (708024240).

Almost surely, 2^25561218746 is an apocalyptic number.

25561218746 is a deficient number, since it is larger than the sum of its proper divisors (19752332614).

25561218746 is a wasteful number, since it uses less digits than its factorization.

25561218746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359.

The product of its digits is 806400, while the sum is 47.

The spelling of 25561218746 in words is "twenty-five billion, five hundred sixty-one million, two hundred eighteen thousand, seven hundred forty-six".