6447606818 has 8 divisors (see below), whose sum is σ = 9672061548. Its totient is φ = 3223586304.

The previous prime is 6447606817. The next prime is 6447606857. The reversal of 6447606818 is 8186067446.

It can be written as a sum of positive squares in 2 ways, for example, as 5570084689 + 877522129 = 74633^2 + 29623^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6447606817) 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, 68471 + ... + 132602.

Almost surely, 2^6447606818 is an apocalyptic number.

6447606818 is a deficient number, since it is larger than the sum of its proper divisors (3224454730).

6447606818 is a wasteful number, since it uses less digits than its factorization.

6447606818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217108.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The square root of 6447606818 is about 80296.9913384057. The cubic root of 6447606818 is about 1861.2277339619.

The spelling of 6447606818 in words is "six billion, four hundred forty-seven million, six hundred six thousand, eight hundred eighteen".