25620170617 has 8 divisors (see below), whose sum is σ = 26043138440. Its totient is φ = 25197298560.

The previous prime is 25620170599. The next prime is 25620170647. The reversal of 25620170617 is 71607102652.

It can be written as a sum of positive squares in 4 ways, for example, as 3663154576 + 21957016041 = 60524^2 + 148179^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25620170617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25620170647) 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, 689059 + ... + 725287.

It is an arithmetic number, because the mean of its divisors is an integer number (3255392305).

Almost surely, 2^25620170617 is an apocalyptic number.

It is an amenable number.

25620170617 is a deficient number, since it is larger than the sum of its proper divisors (422967823).

25620170617 is a wasteful number, since it uses less digits than its factorization.

25620170617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47883.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 25620170617 in words is "twenty-five billion, six hundred twenty million, one hundred seventy thousand, six hundred seventeen".