721006749055 has 8 divisors (see below), whose sum is σ = 865234040832. Its totient is φ = 576788104608.

The previous prime is 721006749049. The next prime is 721006749059. The reversal of 721006749055 is 550947600127.

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 721006749055 - 2¹¹ = 721006747007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721006748996 and 721006749014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721006749059) 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, 1976959 + ... + 2313088.

It is an arithmetic number, because the mean of its divisors is an integer number (108154255104).

Almost surely, 2^721006749055 is an apocalyptic number.

721006749055 is a deficient number, since it is larger than the sum of its proper divisors (144227291777).

721006749055 is a wasteful number, since it uses less digits than its factorization.

721006749055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4323665.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 721006749055 in words is "seven hundred twenty-one billion, six million, seven hundred forty-nine thousand, fifty-five".