6721623250457 has 2 divisors, whose sum is σ = 6721623250458. Its totient is φ = 6721623250456.

The previous prime is 6721623250423. The next prime is 6721623250471. The reversal of 6721623250457 is 7540523261276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3749571377161 + 2972051873296 = 1936381^2 + 1723964^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721623250457 - 2⁶ = 6721623250393 is a prime.

It is not a weakly prime, because it can be changed into another prime (6721623250417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360811625228 + 3360811625229.

It is an arithmetic number, because the mean of its divisors is an integer number (3360811625229).

Almost surely, 2^{6721623250457} is an apocalyptic number.

It is an amenable number.

6721623250457 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721623250457 is an equidigital number, since it uses as much as digits as its factorization.

6721623250457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 6721623250457 in words is "six trillion, seven hundred twenty-one billion, six hundred twenty-three million, two hundred fifty thousand, four hundred fifty-seven".