6451276644 has 48 divisors (see below), whose sum is σ = 17605828800. Its totient is φ = 2037244608.

The previous prime is 6451276619. The next prime is 6451276687. The reversal of 6451276644 is 4466721546.

6451276644 is a `hidden beast` number, since 6 + 4 + 512 + 76 + 64 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 6451276644.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569897 + ... + 1574000.

It is an arithmetic number, because the mean of its divisors is an integer number (366788100).

Almost surely, 2^6451276644 is an apocalyptic number.

It is an amenable number.

6451276644 is an abundant number, since it is smaller than the sum of its proper divisors (11154552156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6451276644 is a wasteful number, since it uses less digits than its factorization.

6451276644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143929 (or 3143921 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 6451276644 is about 80319.8396661746. The cubic root of 6451276644 is about 1861.5807893221.

The spelling of 6451276644 in words is "six billion, four hundred fifty-one million, two hundred seventy-six thousand, six hundred forty-four".