646332556418 has 8 divisors (see below), whose sum is σ = 969739955580. Its totient is φ = 323085904560.

The previous prime is 646332556417. The next prime is 646332556469. The reversal of 646332556418 is 814655233646.

It can be written as a sum of positive squares in 2 ways, for example, as 638012745049 + 8319811369 = 798757^2 + 91213^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 646332556418.

It is not an unprimeable number, because it can be changed into a prime (646332556417) 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 3 ways as a sum of consecutive naturals, for example, 40176773 + ... + 40192856.

Almost surely, 2^646332556418 is an apocalyptic number.

646332556418 is a deficient number, since it is larger than the sum of its proper divisors (323407399162).

646332556418 is a wasteful number, since it uses less digits than its factorization.

646332556418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80373652.

The product of its digits is 12441600, while the sum is 53.

The spelling of 646332556418 in words is "six hundred forty-six billion, three hundred thirty-two million, five hundred fifty-six thousand, four hundred eighteen".