25727971673 has 4 divisors (see below), whose sum is σ = 26615143140. Its totient is φ = 24840800208.

The previous prime is 25727971669. The next prime is 25727971679. The reversal of 25727971673 is 37617972752.

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 6926899984 + 18801071689 = 83228^2 + 137117^2 .

It is a cyclic number.

It is not a de Polignac number, because 25727971673 - 2² = 25727971669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25727971679) 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 3 ways as a sum of consecutive naturals, for example, 443585690 + ... + 443585747.

It is an arithmetic number, because the mean of its divisors is an integer number (6653785785).

Almost surely, 2^25727971673 is an apocalyptic number.

It is an amenable number.

25727971673 is a deficient number, since it is larger than the sum of its proper divisors (887171467).

25727971673 is an equidigital number, since it uses as much as digits as its factorization.

25727971673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887171466.

The product of its digits is 7779240, while the sum is 56.

The spelling of 25727971673 in words is "twenty-five billion, seven hundred twenty-seven million, nine hundred seventy-one thousand, six hundred seventy-three".