6516491671 has 2 divisors, whose sum is σ = 6516491672. Its totient is φ = 6516491670.

The previous prime is 6516491659. The next prime is 6516491711. The reversal of 6516491671 is 1761946156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6516491671 - 2¹⁵ = 6516458903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6516491771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258245835 + 3258245836.

It is an arithmetic number, because the mean of its divisors is an integer number (3258245836).

Almost surely, 2^6516491671 is an apocalyptic number.

6516491671 is a deficient number, since it is larger than the sum of its proper divisors (1).

6516491671 is an equidigital number, since it uses as much as digits as its factorization.

6516491671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 6516491671 is about 80724.7896931296. The cubic root of 6516491671 is about 1867.8325876460.

The spelling of 6516491671 in words is "six billion, five hundred sixteen million, four hundred ninety-one thousand, six hundred seventy-one".