721659934510679 has 4 divisors (see below), whose sum is σ = 721678628949576. Its totient is φ = 721641240071784.

The previous prime is 721659934510673. The next prime is 721659934510717. The reversal of 721659934510679 is 976015439956127.

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 721659934510679 - 2¹⁶ = 721659934445143 is a prime.

It is a super-3 number, since 3×721659934510679³ (a number of 46 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721659934510673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9347161544 + ... + 9347238749.

It is an arithmetic number, because the mean of its divisors is an integer number (180419657237394).

Almost surely, 2^{721659934510679} is an apocalyptic number.

721659934510679 is a deficient number, since it is larger than the sum of its proper divisors (18694438897).

721659934510679 is a wasteful number, since it uses less digits than its factorization.

721659934510679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18694438896.

The product of its (nonzero) digits is 771573600, while the sum is 74.

The spelling of 721659934510679 in words is "seven hundred twenty-one trillion, six hundred fifty-nine billion, nine hundred thirty-four million, five hundred ten thousand, six hundred seventy-nine".