6499815161 has 18 divisors (see below), whose sum is σ = 7604891550. Its totient is φ = 5539121280.

The previous prime is 6499815151. The next prime is 6499815163. The reversal of 6499815161 is 1615189946.

It can be written as a sum of positive squares in 3 ways, for example, as 1089330025 + 5410485136 = 33005^2 + 73556^2 .

It is not a de Polignac number, because 6499815161 - 2³⁰ = 5426073337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6499815163) 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 in 17 ways as a sum of consecutive naturals, for example, 1603265 + ... + 1607313.

It is an arithmetic number, because the mean of its divisors is an integer number (422493975).

Almost surely, 2^6499815161 is an apocalyptic number.

It is an amenable number.

6499815161 is a deficient number, since it is larger than the sum of its proper divisors (1105076389).

6499815161 is an equidigital number, since it uses as much as digits as its factorization.

6499815161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4425 (or 4237 counting only the distinct ones).

The product of its digits is 466560, while the sum is 50.

The square root of 6499815161 is about 80621.4311520206. The cubic root of 6499815161 is about 1866.2378881479.

The spelling of 6499815161 in words is "six billion, four hundred ninety-nine million, eight hundred fifteen thousand, one hundred sixty-one".