721544462813 has 2 divisors, whose sum is σ = 721544462814. Its totient is φ = 721544462812.

The previous prime is 721544462729. The next prime is 721544462833. The reversal of 721544462813 is 318264445127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 715237244089 + 6307218724 = 845717^2 + 79418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721544462813 is a prime.

It is a super-2 number, since 2×721544462813² (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 (721544462833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360772231406 + 360772231407.

It is an arithmetic number, because the mean of its divisors is an integer number (360772231407).

Almost surely, 2^721544462813 is an apocalyptic number.

It is an amenable number.

721544462813 is a deficient number, since it is larger than the sum of its proper divisors (1).

721544462813 is an equidigital number, since it uses as much as digits as its factorization.

721544462813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 47.

The spelling of 721544462813 in words is "seven hundred twenty-one billion, five hundred forty-four million, four hundred sixty-two thousand, eight hundred thirteen".