5171720555 has 16 divisors (see below), whose sum is σ = 6252146688. Its totient is φ = 4106700000.

The previous prime is 5171720527. The next prime is 5171720611. The reversal of 5171720555 is 5550271715.

It is not a de Polignac number, because 5171720555 - 2⁸ = 5171720299 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1471250 + ... + 1474760.

It is an arithmetic number, because the mean of its divisors is an integer number (390759168).

Almost surely, 2^5171720555 is an apocalyptic number.

5171720555 is a deficient number, since it is larger than the sum of its proper divisors (1080426133).

5171720555 is a wasteful number, since it uses less digits than its factorization.

5171720555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5618.

The product of its (nonzero) digits is 61250, while the sum is 38.

The square root of 5171720555 is about 71914.6755189787. The cubic root of 5171720555 is about 1729.3318897648.

The spelling of 5171720555 in words is "five billion, one hundred seventy-one million, seven hundred twenty thousand, five hundred fifty-five".