25642518722 has 18 divisors (see below), whose sum is σ = 38726094393. Its totient is φ = 12734411184.

The previous prime is 25642518721. The next prime is 25642518743. The reversal of 25642518722 is 22781524652.

It can be written as a sum of positive squares in 2 ways, for example, as 22335003601 + 3307515121 = 149449^2 + 57511^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=113231.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25642518721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 45065654 + ... + 45066222.

Almost surely, 2^25642518722 is an apocalyptic number.

25642518722 is a deficient number, since it is larger than the sum of its proper divisors (13083575671).

25642518722 is an frugal number, since it uses more digits than its factorization.

25642518722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538 (or 770 counting only the distinct ones).

The product of its digits is 537600, while the sum is 44.

The spelling of 25642518722 in words is "twenty-five billion, six hundred forty-two million, five hundred eighteen thousand, seven hundred twenty-two".