6446445064 has 16 divisors (see below), whose sum is σ = 12097285200. Its totient is φ = 3220502352.

The previous prime is 6446445053. The next prime is 6446445073. The reversal of 6446445064 is 4605446446.

It is a self number, because there is not a number n which added to its sum of digits gives 6446445064.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329934 + ... + 348925.

It is an arithmetic number, because the mean of its divisors is an integer number (756080325).

Almost surely, 2^6446445064 is an apocalyptic number.

It is an amenable number.

6446445064 is a deficient number, since it is larger than the sum of its proper divisors (5650840136).

6446445064 is a wasteful number, since it uses less digits than its factorization.

6446445064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680052 (or 680048 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 43.

The square root of 6446445064 is about 80289.7569058470. The cubic root of 6446445064 is about 1861.1159395805.

The spelling of 6446445064 in words is "six billion, four hundred forty-six million, four hundred forty-five thousand, sixty-four".