25561218747 has 8 divisors (see below), whose sum is σ = 34123039744. Its totient is φ = 17020105128.

The previous prime is 25561218703. The next prime is 25561218763. The reversal of 25561218747 is 74781216552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25561218747 - 2⁷ = 25561218619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25561218696 and 25561218705.

It is not an unprimeable number, because it can be changed into a prime (25565218747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5173963 + ... + 5178900.

It is an arithmetic number, because the mean of its divisors is an integer number (4265379968).

Almost surely, 2^25561218747 is an apocalyptic number.

25561218747 is a deficient number, since it is larger than the sum of its proper divisors (8561820997).

25561218747 is a wasteful number, since it uses less digits than its factorization.

25561218747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10353689.

The product of its digits is 940800, while the sum is 48.

The spelling of 25561218747 in words is "twenty-five billion, five hundred sixty-one million, two hundred eighteen thousand, seven hundred forty-seven".