721674474376547 has 2 divisors, whose sum is σ = 721674474376548. Its totient is φ = 721674474376546.

The previous prime is 721674474376507. The next prime is 721674474376549. The reversal of 721674474376547 is 745673474476127.

721674474376547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721674474376547 - 2³⁸ = 721399596469603 is a prime.

Together with 721674474376549, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (721674474376549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360837237188273 + 360837237188274.

It is an arithmetic number, because the mean of its divisors is an integer number (360837237188274).

Almost surely, 2^{721674474376547} is an apocalyptic number.

721674474376547 is a deficient number, since it is larger than the sum of its proper divisors (1).

721674474376547 is an equidigital number, since it uses as much as digits as its factorization.

721674474376547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4646799360, while the sum is 74.

The spelling of 721674474376547 in words is "seven hundred twenty-one trillion, six hundred seventy-four billion, four hundred seventy-four million, three hundred seventy-six thousand, five hundred forty-seven".