671622216523 has 2 divisors, whose sum is σ = 671622216524. Its totient is φ = 671622216522.

The previous prime is 671622216493. The next prime is 671622216571. The reversal of 671622216523 is 325612226176.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671622216523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 671622216523.

It is not a weakly prime, because it can be changed into another prime (671622216323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335811108261 + 335811108262.

It is an arithmetic number, because the mean of its divisors is an integer number (335811108262).

Almost surely, 2^671622216523 is an apocalyptic number.

671622216523 is a deficient number, since it is larger than the sum of its proper divisors (1).

671622216523 is an equidigital number, since it uses as much as digits as its factorization.

671622216523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 43.

The spelling of 671622216523 in words is "six hundred seventy-one billion, six hundred twenty-two million, two hundred sixteen thousand, five hundred twenty-three".