25616124565 has 8 divisors (see below), whose sum is σ = 31319337528. Its totient is φ = 20106240960.

The previous prime is 25616124563. The next prime is 25616124571. The reversal of 25616124565 is 56542161652.

It can be written as a sum of positive squares in 4 ways, for example, as 13428406161 + 12187718404 = 115881^2 + 110398^2 .

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

It is not a de Polignac number, because 25616124565 - 2¹ = 25616124563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25616124563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48332046 + ... + 48332575.

It is an arithmetic number, because the mean of its divisors is an integer number (3914917191).

Almost surely, 2^25616124565 is an apocalyptic number.

It is an amenable number.

25616124565 is a deficient number, since it is larger than the sum of its proper divisors (5703212963).

25616124565 is an equidigital number, since it uses as much as digits as its factorization.

25616124565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96664679.

The product of its digits is 432000, while the sum is 43.

The spelling of 25616124565 in words is "twenty-five billion, six hundred sixteen million, one hundred twenty-four thousand, five hundred sixty-five".