721579365873 has 12 divisors (see below), whose sum is σ = 1080884317968. Its totient is φ = 481052910420.

The previous prime is 721579365841. The next prime is 721579365883. The reversal of 721579365873 is 378563975127.

721579365873 is a `hidden beast` number, since 7 + 2 + 1 + 579 + 3 + 6 + 58 + 7 + 3 = 666.

It is not a de Polignac number, because 721579365873 - 2⁵ = 721579365841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721579365873.

It is not an unprimeable number, because it can be changed into a prime (721579365883) 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 11 ways as a sum of consecutive naturals, for example, 1484730963 + ... + 1484731448.

It is an arithmetic number, because the mean of its divisors is an integer number (90073693164).

Almost surely, 2^721579365873 is an apocalyptic number.

It is an amenable number.

721579365873 is a deficient number, since it is larger than the sum of its proper divisors (359304952095).

721579365873 is an equidigital number, since it uses as much as digits as its factorization.

721579365873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969462426 (or 2969462414 counting only the distinct ones).

The product of its digits is 66679200, while the sum is 63.

The spelling of 721579365873 in words is "seven hundred twenty-one billion, five hundred seventy-nine million, three hundred sixty-five thousand, eight hundred seventy-three".