63666698999 has 4 divisors (see below), whose sum is σ = 65021309664. Its totient is φ = 62312088336.

The previous prime is 63666698983. The next prime is 63666699007. The reversal of 63666698999 is 99989666636.

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 63666698999 - 2⁴ = 63666698983 is a prime.

It is a super-2 number, since 2×63666698999² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63666698939) 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, 677305262 + ... + 677305355.

It is an arithmetic number, because the mean of its divisors is an integer number (16255327416).

Almost surely, 2^63666698999 is an apocalyptic number.

63666698999 is a deficient number, since it is larger than the sum of its proper divisors (1354610665).

63666698999 is a wasteful number, since it uses less digits than its factorization.

63666698999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354610664.

The product of its digits is 1224440064, while the sum is 77.

The spelling of 63666698999 in words is "sixty-three billion, six hundred sixty-six million, six hundred ninety-eight thousand, nine hundred ninety-nine".