25279678705 has 4 divisors (see below), whose sum is σ = 30335614452. Its totient is φ = 20223742960.

The previous prime is 25279678703. The next prime is 25279678747. The reversal of 25279678705 is 50787697252.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16643322081 + 8636356624 = 129009^2 + 92932^2 .

It is not a de Polignac number, because 25279678705 - 2¹ = 25279678703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25279678705.

It is not an unprimeable number, because it can be changed into a prime (25279678703) 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 3 ways as a sum of consecutive naturals, for example, 2527967866 + ... + 2527967875.

It is an arithmetic number, because the mean of its divisors is an integer number (7583903613).

Almost surely, 2^25279678705 is an apocalyptic number.

It is an amenable number.

25279678705 is a deficient number, since it is larger than the sum of its proper divisors (5055935747).

25279678705 is an equidigital number, since it uses as much as digits as its factorization.

25279678705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055935746.

The product of its (nonzero) digits is 14817600, while the sum is 58.

The spelling of 25279678705 in words is "twenty-five billion, two hundred seventy-nine million, six hundred seventy-eight thousand, seven hundred five".