25748406857 has 4 divisors (see below), whose sum is σ = 25752964116. Its totient is φ = 25743849600.

The previous prime is 25748406851. The next prime is 25748406877. The reversal of 25748406857 is 75860484752.

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 8010429001 + 17737977856 = 89501^2 + 133184^2 .

It is a cyclic number.

It is not a de Polignac number, because 25748406857 - 2¹² = 25748402761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25748406851) 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, 2270144 + ... + 2281457.

It is an arithmetic number, because the mean of its divisors is an integer number (6438241029).

Almost surely, 2^25748406857 is an apocalyptic number.

It is an amenable number.

25748406857 is a deficient number, since it is larger than the sum of its proper divisors (4557259).

25748406857 is an equidigital number, since it uses as much as digits as its factorization.

25748406857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4557258.

The product of its (nonzero) digits is 15052800, while the sum is 56.

The spelling of 25748406857 in words is "twenty-five billion, seven hundred forty-eight million, four hundred six thousand, eight hundred fifty-seven".