721522522451273 has 2 divisors, whose sum is σ = 721522522451274. Its totient is φ = 721522522451272.

The previous prime is 721522522451261. The next prime is 721522522451279. The reversal of 721522522451273 is 372154225225127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672473188039744 + 49049334411529 = 25932088^2 + 7003523^2 .

It is a cyclic number.

It is not a de Polignac number, because 721522522451273 - 2⁴ = 721522522451257 is a prime.

It is not a weakly prime, because it can be changed into another prime (721522522451279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360761261225636 + 360761261225637.

It is an arithmetic number, because the mean of its divisors is an integer number (360761261225637).

Almost surely, 2^{721522522451273} is an apocalyptic number.

It is an amenable number.

721522522451273 is a deficient number, since it is larger than the sum of its proper divisors (1).

721522522451273 is an equidigital number, since it uses as much as digits as its factorization.

721522522451273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704000, while the sum is 50.

The spelling of 721522522451273 in words is "seven hundred twenty-one trillion, five hundred twenty-two billion, five hundred twenty-two million, four hundred fifty-one thousand, two hundred seventy-three".