6620221667 has 2 divisors, whose sum is σ = 6620221668. Its totient is φ = 6620221666.

The previous prime is 6620221639. The next prime is 6620221747. The reversal of 6620221667 is 7661220266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6620221667 - 2¹⁰ = 6620220643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6620221667.

It is not a weakly prime, because it can be changed into another prime (6620221627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310110833 + 3310110834.

It is an arithmetic number, because the mean of its divisors is an integer number (3310110834).

Almost surely, 2^6620221667 is an apocalyptic number.

6620221667 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620221667 is an equidigital number, since it uses as much as digits as its factorization.

6620221667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 6620221667 is about 81364.7446195218. The cubic root of 6620221667 is about 1877.6912267674.

The spelling of 6620221667 in words is "six billion, six hundred twenty million, two hundred twenty-one thousand, six hundred sixty-seven".