25564138786 has 16 divisors (see below), whose sum is σ = 38924692344. Its totient is φ = 12589720704.

The previous prime is 25564138771. The next prime is 25564138793. The reversal of 25564138786 is 68783146552.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25545948561 + 18190225 = 159831^2 + 4265^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12421 + ... + 226456.

Almost surely, 2^25564138786 is an apocalyptic number.

25564138786 is a deficient number, since it is larger than the sum of its proper divisors (13360553558).

25564138786 is a wasteful number, since it uses less digits than its factorization.

25564138786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239685.

The product of its digits is 9676800, while the sum is 55.

The spelling of 25564138786 in words is "twenty-five billion, five hundred sixty-four million, one hundred thirty-eight thousand, seven hundred eighty-six".