6445555264 has 14 divisors (see below), whose sum is σ = 12790398854. Its totient is φ = 3222777600.

The previous prime is 6445555243. The next prime is 6445555271. The reversal of 6445555264 is 4625555446.

It can be written as a sum of positive squares in only one way, i.e., 4860878400 + 1584676864 = 69720^2 + 39808^2 .

It is a super-2 number, since 2×6445555264² = 83090365322556219392, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 50355837 + ... + 50355964.

Almost surely, 2^6445555264 is an apocalyptic number.

6445555264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6445555264 is a deficient number, since it is larger than the sum of its proper divisors (6344843590).

6445555264 is a wasteful number, since it uses less digits than its factorization.

6445555264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100711813 (or 100711803 counting only the distinct ones).

The product of its digits is 2880000, while the sum is 46.

The square root of 6445555264 is about 80284.2155345620. The cubic root of 6445555264 is about 1861.0303059667.

The spelling of 6445555264 in words is "six billion, four hundred forty-five million, five hundred fifty-five thousand, two hundred sixty-four".