63998693107 has 4 divisors (see below), whose sum is σ = 64002134016. Its totient is φ = 63995252200.

The previous prime is 63998693029. The next prime is 63998693131. The reversal of 63998693107 is 70139689936.

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 63998693107 - 2¹⁵ = 63998660339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63998693147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1692403 + ... + 1729804.

It is an arithmetic number, because the mean of its divisors is an integer number (16000533504).

Almost surely, 2^63998693107 is an apocalyptic number.

63998693107 is a deficient number, since it is larger than the sum of its proper divisors (3440909).

63998693107 is a wasteful number, since it uses less digits than its factorization.

63998693107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440908.

The product of its (nonzero) digits is 13226976, while the sum is 61.

The spelling of 63998693107 in words is "sixty-three billion, nine hundred ninety-eight million, six hundred ninety-three thousand, one hundred seven".