721632865117 has 8 divisors (see below), whose sum is σ = 725448528000. Its totient is φ = 717825014784.

The previous prime is 721632865111. The next prime is 721632865123. The reversal of 721632865117 is 711568236127.

It is an interprime number because it is at equal distance from previous prime (721632865111) and next prime (721632865123).

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 721632865117 - 2¹¹ = 721632863069 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 (721632865111) 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 7 ways as a sum of consecutive naturals, for example, 1767867 + ... + 2137432.

It is an arithmetic number, because the mean of its divisors is an integer number (90681066000).

Almost surely, 2^721632865117 is an apocalyptic number.

It is an amenable number.

721632865117 is a deficient number, since it is larger than the sum of its proper divisors (3815662883).

721632865117 is a wasteful number, since it uses less digits than its factorization.

721632865117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906275.

The product of its digits is 846720, while the sum is 49.

The spelling of 721632865117 in words is "seven hundred twenty-one billion, six hundred thirty-two million, eight hundred sixty-five thousand, one hundred seventeen".