25647381904 has 15 divisors (see below), whose sum is σ = 49693043617. Its totient is φ = 12823370656.

The previous prime is 25647381889. The next prime is 25647381911. The reversal of 25647381904 is 40918374652.

It is a happy number.

The square root of 25647381904 is 160148.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 19864083600 + 5783298304 = 140940^2 + 76048^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 620574 + ... + 660610.

It is a 2-persistent number, because it is pandigital, and so is 2⋅25647381904 = 51294763808, but 3⋅25647381904 = 76942145712 is not.

Almost surely, 2^25647381904 is an apocalyptic number.

25647381904 is the 160148-th square number.

It is an amenable number.

25647381904 is a deficient number, since it is larger than the sum of its proper divisors (24045661713).

25647381904 is an frugal number, since it uses more digits than its factorization.

25647381904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80082 (or 40039 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

Multiplying 25647381904 by its sum of digits (49), we get a square (1256721713296 = 1121036²).

The spelling of 25647381904 in words is "twenty-five billion, six hundred forty-seven million, three hundred eighty-one thousand, nine hundred four".