5000166991 has 2 divisors, whose sum is σ = 5000166992. Its totient is φ = 5000166990.

The previous prime is 5000166989. The next prime is 5000167019. The reversal of 5000166991 is 1996610005.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5000166991 - 2¹ = 5000166989 is a prime.

Together with 5000166989, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 5000166991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5000166971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500083495 + 2500083496.

It is an arithmetic number, because the mean of its divisors is an integer number (2500083496).

Almost surely, 2^5000166991 is an apocalyptic number.

5000166991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5000166991 is an equidigital number, since it uses as much as digits as its factorization.

5000166991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 5000166991 is about 70711.8589134807. The cubic root of 5000166991 is about 1709.9949831710.

Adding to 5000166991 its reverse (1996610005), we get a palindrome (6996776996).

It can be divided in two parts, 5000 and 166991, that added together give a triangular number (171991 = T₅₈₆).

The spelling of 5000166991 in words is "five billion, one hundred sixty-six thousand, nine hundred ninety-one".