721010993617 has 2 divisors, whose sum is σ = 721010993618. Its totient is φ = 721010993616.

The previous prime is 721010993611. The next prime is 721010993623. The reversal of 721010993617 is 716399010127.

It is a balanced prime because it is at equal distance from previous prime (721010993611) and next prime (721010993623).

It can be written as a sum of positive squares in only one way, i.e., 467276147776 + 253734845841 = 683576^2 + 503721^2 .

It is a cyclic number.

It is not a de Polignac number, because 721010993617 - 2¹⁵ = 721010960849 is a prime.

It is a super-2 number, since 2×721010993617² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (721010993611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360505496808 + 360505496809.

It is an arithmetic number, because the mean of its divisors is an integer number (360505496809).

Almost surely, 2^721010993617 is an apocalyptic number.

It is an amenable number.

721010993617 is a deficient number, since it is larger than the sum of its proper divisors (1).

721010993617 is an equidigital number, since it uses as much as digits as its factorization.

721010993617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 46.

The spelling of 721010993617 in words is "seven hundred twenty-one billion, ten million, nine hundred ninety-three thousand, six hundred seventeen".