6461669278 has 24 divisors (see below), whose sum is σ = 10155824280. Its totient is φ = 3079767600.

The previous prime is 6461669273. The next prime is 6461669287. The reversal of 6461669278 is 8729661646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6461669273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353053 + ... + 370903.

It is an arithmetic number, because the mean of its divisors is an integer number (423159345).

Almost surely, 2^6461669278 is an apocalyptic number.

6461669278 is a deficient number, since it is larger than the sum of its proper divisors (3694155002).

6461669278 is a wasteful number, since it uses less digits than its factorization.

6461669278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18040 (or 17961 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The square root of 6461669278 is about 80384.5089429549. The cubic root of 6461669278 is about 1862.5798860559.

The spelling of 6461669278 in words is "six billion, four hundred sixty-one million, six hundred sixty-nine thousand, two hundred seventy-eight".