108721693663 has 16 divisors (see below), whose sum is σ = 119210551200. Its totient is φ = 98334369280.

The previous prime is 108721693601. The next prime is 108721693673. The reversal of 108721693663 is 366396127801.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108721693663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 108721693663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108721693673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3287253 + ... + 3320161.

It is an arithmetic number, because the mean of its divisors is an integer number (7450659450).

Almost surely, 2^108721693663 is an apocalyptic number.

108721693663 is a deficient number, since it is larger than the sum of its proper divisors (10488857537).

108721693663 is a wasteful number, since it uses less digits than its factorization.

108721693663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34442.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 108721693663 in words is "one hundred eight billion, seven hundred twenty-one million, six hundred ninety-three thousand, six hundred sixty-three".