25560661178 has 16 divisors (see below), whose sum is σ = 42069363336. Its totient is φ = 11574638400.

The previous prime is 25560661171. The next prime is 25560661199. The reversal of 25560661178 is 87116606552.

It can be written as a sum of positive squares in 4 ways, for example, as 22188187849 + 3372473329 = 148957^2 + 58073^2 .

It is not an unprimeable number, because it can be changed into a prime (25560661171) 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, 9273173 + ... + 9275928.

Almost surely, 2^25560661178 is an apocalyptic number.

25560661178 is a deficient number, since it is larger than the sum of its proper divisors (16508702158).

25560661178 is a wasteful number, since it uses less digits than its factorization.

25560661178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18549169.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 25560661178 in words is "twenty-five billion, five hundred sixty million, six hundred sixty-one thousand, one hundred seventy-eight".