25717560545 has 8 divisors (see below), whose sum is σ = 30904604520. Its totient is φ = 20545027200.

The previous prime is 25717560527. The next prime is 25717560571. The reversal of 25717560545 is 54506571752.

It can be written as a sum of positive squares in 4 ways, for example, as 36857041 + 25680703504 = 6071^2 + 160252^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25717560545 - 2²⁰ = 25716511969 is a prime.

It is a super-2 number, since 2×25717560545² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25717560545.

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, 3623756 + ... + 3630845.

It is an arithmetic number, because the mean of its divisors is an integer number (3863075565).

Almost surely, 2^25717560545 is an apocalyptic number.

It is an amenable number.

25717560545 is a deficient number, since it is larger than the sum of its proper divisors (5187043975).

25717560545 is an equidigital number, since it uses as much as digits as its factorization.

25717560545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7255315.

The product of its (nonzero) digits is 1470000, while the sum is 47.

The spelling of 25717560545 in words is "twenty-five billion, seven hundred seventeen million, five hundred sixty thousand, five hundred forty-five".