646493394646 has 32 divisors (see below), whose sum is σ = 1062503671680. Its totient is φ = 292581859200.

The previous prime is 646493394593. The next prime is 646493394647.

646493394646 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646493394647) 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 15 ways as a sum of consecutive naturals, for example, 35933265 + ... + 35951251.

It is an arithmetic number, because the mean of its divisors is an integer number (33203239740).

Almost surely, 2^646493394646 is an apocalyptic number.

646493394646 is a deficient number, since it is larger than the sum of its proper divisors (416010277034).

646493394646 is a wasteful number, since it uses less digits than its factorization.

646493394646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25020.

The product of its digits is 241864704, while the sum is 64.

The spelling of 646493394646 in words is "six hundred forty-six billion, four hundred ninety-three million, three hundred ninety-four thousand, six hundred forty-six".