646447235764 has 12 divisors (see below), whose sum is σ = 1234126541088. Its totient is φ = 293839652600.

The previous prime is 646447235741. The next prime is 646447235773. The reversal of 646447235764 is 467532744646.

It is a junction number, because it is equal to n+sod(n) for n = 646447235699 and 646447235708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7345991272 + ... + 7345991359.

It is an arithmetic number, because the mean of its divisors is an integer number (102843878424).

Almost surely, 2^646447235764 is an apocalyptic number.

It is an amenable number.

646447235764 is a deficient number, since it is larger than the sum of its proper divisors (587679305324).

646447235764 is a wasteful number, since it uses less digits than its factorization.

646447235764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14691982646 (or 14691982644 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 58.

The spelling of 646447235764 in words is "six hundred forty-six billion, four hundred forty-seven million, two hundred thirty-five thousand, seven hundred sixty-four".