25540395656 has 32 divisors (see below), whose sum is σ = 48589926840. Its totient is φ = 12584214528.

The previous prime is 25540395653. The next prime is 25540395719. The reversal of 25540395656 is 65659304552.

It can be written as a sum of positive squares in 4 ways, for example, as 12063507556 + 13476888100 = 109834^2 + 116090^2 .

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (25540395653) 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, 110180 + ... + 251436.

Almost surely, 2^25540395656 is an apocalyptic number.

It is an amenable number.

25540395656 is a deficient number, since it is larger than the sum of its proper divisors (23049531184).

25540395656 is a wasteful number, since it uses less digits than its factorization.

25540395656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141593 (or 141589 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 50.

The spelling of 25540395656 in words is "twenty-five billion, five hundred forty million, three hundred ninety-five thousand, six hundred fifty-six".