100721878805717 has 8 divisors (see below), whose sum is σ = 108469793752320. Its totient is φ = 92973975018480.

The previous prime is 100721878805689. The next prime is 100721878805719. The reversal of 100721878805717 is 717508878127001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100721878805717 - 2¹⁰ = 100721878804693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100721878805717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100721878805719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32334992 + ... + 35312822.

It is an arithmetic number, because the mean of its divisors is an integer number (13558724219040).

Almost surely, 2^{100721878805717} is an apocalyptic number.

It is an amenable number.

100721878805717 is a deficient number, since it is larger than the sum of its proper divisors (7747914946603).

100721878805717 is a wasteful number, since it uses less digits than its factorization.

100721878805717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5579683.

The product of its (nonzero) digits is 12293120, while the sum is 62.

The spelling of 100721878805717 in words is "one hundred trillion, seven hundred twenty-one billion, eight hundred seventy-eight million, eight hundred five thousand, seven hundred seventeen".