25664315478 has 16 divisors (see below), whose sum is σ = 52522320576. Its totient is φ = 8355823560.

The previous prime is 25664315477. The next prime is 25664315483. The reversal of 25664315478 is 87451346652.

It is a self number, because there is not a number n which added to its sum of digits gives 25664315478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25664315471) 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 7 ways as a sum of consecutive naturals, for example, 49736788 + ... + 49737303.

It is an arithmetic number, because the mean of its divisors is an integer number (3282645036).

Almost surely, 2^25664315478 is an apocalyptic number.

25664315478 is an abundant number, since it is smaller than the sum of its proper divisors (26858005098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25664315478 is a wasteful number, since it uses less digits than its factorization.

25664315478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99474139.

The product of its digits is 4838400, while the sum is 51.

The spelling of 25664315478 in words is "twenty-five billion, six hundred sixty-four million, three hundred fifteen thousand, four hundred seventy-eight".