646673376646 has 16 divisors (see below), whose sum is σ = 1060648017408. Its totient is φ = 293260438600.

The previous prime is 646673376631. The next prime is 646673376649.

646673376646 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 (646673376649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34090570 + ... + 34109533.

It is an arithmetic number, because the mean of its divisors is an integer number (66290501088).

Almost surely, 2^646673376646 is an apocalyptic number.

646673376646 is a deficient number, since it is larger than the sum of its proper divisors (413974640762).

646673376646 is a wasteful number, since it uses less digits than its factorization.

646673376646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68200547.

The product of its digits is 329204736, while the sum is 64.

The spelling of 646673376646 in words is "six hundred forty-six billion, six hundred seventy-three million, three hundred seventy-six thousand, six hundred forty-six".