721674474376439 has 2 divisors, whose sum is σ = 721674474376440. Its totient is φ = 721674474376438.

The previous prime is 721674474376423. The next prime is 721674474376507. The reversal of 721674474376439 is 934673474476127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721674474376439 - 2⁴ = 721674474376423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721674474370439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360837237188219 + 360837237188220.

It is an arithmetic number, because the mean of its divisors is an integer number (360837237188220).

Almost surely, 2^{721674474376439} is an apocalyptic number.

721674474376439 is a deficient number, since it is larger than the sum of its proper divisors (1).

721674474376439 is an equidigital number, since it uses as much as digits as its factorization.

721674474376439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584673792, while the sum is 74.

The spelling of 721674474376439 in words is "seven hundred twenty-one trillion, six hundred seventy-four billion, four hundred seventy-four million, three hundred seventy-six thousand, four hundred thirty-nine".