616166591 has 2 divisors, whose sum is σ = 616166592. Its totient is φ = 616166590.

The previous prime is 616166557. The next prime is 616166609. The reversal of 616166591 is 195661616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 616166591 - 2²⁶ = 549057727 is a prime.

It is a super-2 number, since 2×616166591² = 759322535729122562, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616163591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308083295 + 308083296.

It is an arithmetic number, because the mean of its divisors is an integer number (308083296).

Almost surely, 2^616166591 is an apocalyptic number.

616166591 is a deficient number, since it is larger than the sum of its proper divisors (1).

616166591 is an equidigital number, since it uses as much as digits as its factorization.

616166591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 616166591 is about 24822.7031364435. The cubic root of 616166591 is about 850.9408686601.

The spelling of 616166591 in words is "six hundred sixteen million, one hundred sixty-six thousand, five hundred ninety-one".