6499666277 has 4 divisors (see below), whose sum is σ = 6999640620. Its totient is φ = 5999691936.

The previous prime is 6499666273. The next prime is 6499666297. The reversal of 6499666277 is 7726669946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7726669946 = 2 ⋅3863334973.

It can be written as a sum of positive squares in 2 ways, for example, as 523448641 + 5976217636 = 22879^2 + 77306^2 .

It is a cyclic number.

It is not a de Polignac number, because 6499666277 - 2² = 6499666273 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6499666273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249987152 + ... + 249987177.

It is an arithmetic number, because the mean of its divisors is an integer number (1749910155).

Almost surely, 2^6499666277 is an apocalyptic number.

It is an amenable number.

6499666277 is a deficient number, since it is larger than the sum of its proper divisors (499974343).

6499666277 is a wasteful number, since it uses less digits than its factorization.

6499666277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499974342.

The product of its digits is 41150592, while the sum is 62.

The square root of 6499666277 is about 80620.5077942331. The cubic root of 6499666277 is about 1866.2236387640.

The spelling of 6499666277 in words is "six billion, four hundred ninety-nine million, six hundred sixty-six thousand, two hundred seventy-seven".