6657022809 has 18 divisors (see below), whose sum is σ = 10214605310. Its totient is φ = 4176953856.

The previous prime is 6657022807. The next prime is 6657022831. The reversal of 6657022809 is 9082207566.

It can be written as a sum of positive squares in 3 ways, for example, as 2310917184 + 4346105625 = 48072^2 + 65925^2 .

It is not a de Polignac number, because 6657022809 - 2¹ = 6657022807 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6657022807) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1277104 + ... + 1282305.

Almost surely, 2^6657022809 is an apocalyptic number.

It is an amenable number.

6657022809 is a deficient number, since it is larger than the sum of its proper divisors (3557582501).

6657022809 is a wasteful number, since it uses less digits than its factorization.

6657022809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559449 (or 2559429 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 6657022809 is about 81590.5803938175. The cubic root of 6657022809 is about 1881.1640980573.

The spelling of 6657022809 in words is "six billion, six hundred fifty-seven million, twenty-two thousand, eight hundred nine".