5172116721565 has 8 divisors (see below), whose sum is σ = 6206839257528. Its totient is φ = 4137493916160.

The previous prime is 5172116721553. The next prime is 5172116721617. The reversal of 5172116721565 is 5651276112715.

It can be written as a sum of positive squares in 4 ways, for example, as 388784672676 + 4783332048889 = 623526^2 + 2187083^2 .

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

It is not a de Polignac number, because 5172116721565 - 2¹⁹ = 5172116197277 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 24818496 + ... + 25026025.

It is an arithmetic number, because the mean of its divisors is an integer number (775854907191).

Almost surely, 2^{5172116721565} is an apocalyptic number.

It is an amenable number.

5172116721565 is a deficient number, since it is larger than the sum of its proper divisors (1034722535963).

5172116721565 is a wasteful number, since it uses less digits than its factorization.

5172116721565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49865279.

The product of its digits is 882000, while the sum is 49.

The spelling of 5172116721565 in words is "five trillion, one hundred seventy-two billion, one hundred sixteen million, seven hundred twenty-one thousand, five hundred sixty-five".