721551546050663 has 8 divisors (see below), whose sum is σ = 733420364967360. Its totient is φ = 709684020845280.

The previous prime is 721551546050653. The next prime is 721551546050669. The reversal of 721551546050663 is 366050645155127.

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 721551546050663 - 2⁸ = 721551546050407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721551546050599 and 721551546050608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721551546050669) 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, 322303148 + ... + 324534161.

It is an arithmetic number, because the mean of its divisors is an integer number (91677545620920).

Almost surely, 2^{721551546050663} is an apocalyptic number.

721551546050663 is a deficient number, since it is larger than the sum of its proper divisors (11868818916697).

721551546050663 is a wasteful number, since it uses less digits than its factorization.

721551546050663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646855657.

The product of its (nonzero) digits is 22680000, while the sum is 56.

The spelling of 721551546050663 in words is "seven hundred twenty-one trillion, five hundred fifty-one billion, five hundred forty-six million, fifty thousand, six hundred sixty-three".