6621047009 has 2 divisors, whose sum is σ = 6621047010. Its totient is φ = 6621047008.

The previous prime is 6621046987. The next prime is 6621047023. The reversal of 6621047009 is 9007401266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6521047009 + 100000000 = 80753^2 + 10000^2 .

It is a cyclic number.

It is not a de Polignac number, because 6621047009 - 2²⁰ = 6619998433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6621047009.

It is not a weakly prime, because it can be changed into another prime (6621047039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310523504 + 3310523505.

It is an arithmetic number, because the mean of its divisors is an integer number (3310523505).

Almost surely, 2^6621047009 is an apocalyptic number.

It is an amenable number.

6621047009 is a deficient number, since it is larger than the sum of its proper divisors (1).

6621047009 is an equidigital number, since it uses as much as digits as its factorization.

6621047009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 6621047009 is about 81369.8163264487. The cubic root of 6621047009 is about 1877.7692540155.

The spelling of 6621047009 in words is "six billion, six hundred twenty-one million, forty-seven thousand, nine".