63980806999 has 4 divisors (see below), whose sum is σ = 63985970440. Its totient is φ = 63975643560.

The previous prime is 63980806979. The next prime is 63980807041. The reversal of 63980806999 is 99960808936.

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

It is a cyclic number.

It is not a de Polignac number, because 63980806999 - 2⁷ = 63980806871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63980806979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2563089 + ... + 2587930.

It is an arithmetic number, because the mean of its divisors is an integer number (15996492610).

Almost surely, 2^63980806999 is an apocalyptic number.

63980806999 is a deficient number, since it is larger than the sum of its proper divisors (5163441).

63980806999 is a wasteful number, since it uses less digits than its factorization.

63980806999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5163440.

The product of its (nonzero) digits is 45349632, while the sum is 67.

The spelling of 63980806999 in words is "sixty-three billion, nine hundred eighty million, eight hundred six thousand, nine hundred ninety-nine".