721585673623 has 2 divisors, whose sum is σ = 721585673624. Its totient is φ = 721585673622.

The previous prime is 721585673561. The next prime is 721585673629. The reversal of 721585673623 is 326376585127.

It is a strong prime.

It is an emirp because it is prime and its reverse (326376585127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721585673623 - 2¹³ = 721585665431 is a prime.

It is a super-2 number, since 2×721585673623² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721585673629) 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 as a sum of consecutive naturals, namely, 360792836811 + 360792836812.

It is an arithmetic number, because the mean of its divisors is an integer number (360792836812).

Almost surely, 2^721585673623 is an apocalyptic number.

721585673623 is a deficient number, since it is larger than the sum of its proper divisors (1).

721585673623 is an equidigital number, since it uses as much as digits as its factorization.

721585673623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12700800, while the sum is 55.

The spelling of 721585673623 in words is "seven hundred twenty-one billion, five hundred eighty-five million, six hundred seventy-three thousand, six hundred twenty-three".