6620199997 has 2 divisors, whose sum is σ = 6620199998. Its totient is φ = 6620199996.

The previous prime is 6620199991. The next prime is 6620200007. The reversal of 6620199997 is 7999910266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5050376356 + 1569823641 = 71066^2 + 39621^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6620199997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6620199991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310099998 + 3310099999.

It is an arithmetic number, because the mean of its divisors is an integer number (3310099999).

Almost surely, 2^6620199997 is an apocalyptic number.

It is an amenable number.

6620199997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620199997 is an equidigital number, since it uses as much as digits as its factorization.

6620199997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 58.

The square root of 6620199997 is about 81364.6114536289. The cubic root of 6620199997 is about 1877.6891780136.

The spelling of 6620199997 in words is "six billion, six hundred twenty million, one hundred ninety-nine thousand, nine hundred ninety-seven".