5165843991 has 16 divisors (see below), whose sum is σ = 8587377408. Its totient is φ = 2683555200.

The previous prime is 5165843981. The next prime is 5165843993. The reversal of 5165843991 is 1993485615.

It is not a de Polignac number, because 5165843991 - 2¹⁰ = 5165842967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5165843993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11181250 + ... + 11181711.

It is an arithmetic number, because the mean of its divisors is an integer number (536711088).

Almost surely, 2^5165843991 is an apocalyptic number.

5165843991 is a deficient number, since it is larger than the sum of its proper divisors (3421533417).

5165843991 is a wasteful number, since it uses less digits than its factorization.

5165843991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22362982.

The product of its digits is 1166400, while the sum is 51.

The square root of 5165843991 is about 71873.8060144306. The cubic root of 5165843991 is about 1728.6766351587.

It can be divided in two parts, 51658439 and 91, that added together give a triangular number (51658530 = T₁₀₁₆₄).

The spelling of 5165843991 in words is "five billion, one hundred sixty-five million, eight hundred forty-three thousand, nine hundred ninety-one".