25456085657 has 4 divisors (see below), whose sum is σ = 25456506660. Its totient is φ = 25455664656.

The previous prime is 25456085647. The next prime is 25456085723. The reversal of 25456085657 is 75658065452.

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 23628608656 + 1827477001 = 153716^2 + 42749^2 .

It is a cyclic number.

It is not a de Polignac number, because 25456085657 - 2¹² = 25456081561 is a prime.

It is a super-2 number, since 2×25456085657² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25456085599 and 25456085608.

It is not an unprimeable number, because it can be changed into a prime (25456085647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100718 + ... + 247095.

It is an arithmetic number, because the mean of its divisors is an integer number (6364126665).

Almost surely, 2^25456085657 is an apocalyptic number.

It is an amenable number.

25456085657 is a deficient number, since it is larger than the sum of its proper divisors (421003).

25456085657 is an equidigital number, since it uses as much as digits as its factorization.

25456085657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421002.

The product of its (nonzero) digits is 10080000, while the sum is 53.

The spelling of 25456085657 in words is "twenty-five billion, four hundred fifty-six million, eighty-five thousand, six hundred fifty-seven".