63646440126664 has 16 divisors (see below), whose sum is σ = 119399851213020. Its totient is φ = 31806479803200.

The previous prime is 63646440126629. The next prime is 63646440126677. The reversal of 63646440126664 is 46662104464636.

It can be written as a sum of positive squares in 2 ways, for example, as 57083918052100 + 6562522074564 = 7555390^2 + 2561742^2 .

It is a junction number, because it is equal to n+sod(n) for n = 63646440126599 and 63646440126608.

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, 2092516359 + ... + 2092546774.

Almost surely, 2^{63646440126664} is an apocalyptic number.

It is an amenable number.

63646440126664 is a deficient number, since it is larger than the sum of its proper divisors (55753411086356).

63646440126664 is a wasteful number, since it uses less digits than its factorization.

63646440126664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4185065040 (or 4185065036 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 58.

The spelling of 63646440126664 in words is "sixty-three trillion, six hundred forty-six billion, four hundred forty million, one hundred twenty-six thousand, six hundred sixty-four".