63664894826842 has 4 divisors (see below), whose sum is σ = 95497342240266. Its totient is φ = 31832447413420.

The previous prime is 63664894826833. The next prime is 63664894826857. The reversal of 63664894826842 is 24862849846636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55651585080001 + 8013309746841 = 7459999^2 + 2830779^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15916223706709 + ... + 15916223706712.

Almost surely, 2^{63664894826842} is an apocalyptic number.

63664894826842 is a deficient number, since it is larger than the sum of its proper divisors (31832447413424).

63664894826842 is a wasteful number, since it uses less digits than its factorization.

63664894826842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31832447413423.

The product of its digits is 4586471424, while the sum is 76.

The spelling of 63664894826842 in words is "sixty-three trillion, six hundred sixty-four billion, eight hundred ninety-four million, eight hundred twenty-six thousand, eight hundred forty-two".