721149244993 has 2 divisors, whose sum is σ = 721149244994. Its totient is φ = 721149244992.

The previous prime is 721149244973. The next prime is 721149244997. The reversal of 721149244993 is 399442941127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 720626116609 + 523128384 = 848897^2 + 22872^2 .

It is an emirp because it is prime and its reverse (399442941127) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721149244993 is a prime.

It is not a weakly prime, because it can be changed into another prime (721149244997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360574622496 + 360574622497.

It is an arithmetic number, because the mean of its divisors is an integer number (360574622497).

Almost surely, 2^721149244993 is an apocalyptic number.

It is an amenable number.

721149244993 is a deficient number, since it is larger than the sum of its proper divisors (1).

721149244993 is an equidigital number, since it uses as much as digits as its factorization.

721149244993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 55.

The spelling of 721149244993 in words is "seven hundred twenty-one billion, one hundred forty-nine million, two hundred forty-four thousand, nine hundred ninety-three".