25401227618 has 18 divisors (see below), whose sum is σ = 41262966819. Its totient is φ = 11722291152.

The previous prime is 25401227611. The next prime is 25401227659. The reversal of 25401227618 is 81672210452.

It can be written as a sum of positive squares in 5 ways, for example, as 2815045249 + 22586182369 = 53057^2 + 150287^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=112697.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25401227611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2925788 + ... + 2934456.

Almost surely, 2^25401227618 is an apocalyptic number.

25401227618 is a deficient number, since it is larger than the sum of its proper divisors (15861739201).

25401227618 is an frugal number, since it uses more digits than its factorization.

25401227618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17366 (or 8684 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 25401227618 in words is "twenty-five billion, four hundred one million, two hundred twenty-seven thousand, six hundred eighteen".