6663281989 has 32 divisors (see below), whose sum is σ = 8311919616. Its totient is φ = 5201107200.

The previous prime is 6663281959. The next prime is 6663282029. The reversal of 6663281989 is 9891823666.

It is a cyclic number.

It is not a de Polignac number, because 6663281989 - 2¹¹ = 6663279941 is a prime.

It is a super-2 number, since 2×6663281989² = 88798653729863592242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663281909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2912404 + ... + 2914690.

It is an arithmetic number, because the mean of its divisors is an integer number (259747488).

Almost surely, 2^6663281989 is an apocalyptic number.

It is an amenable number.

6663281989 is a deficient number, since it is larger than the sum of its proper divisors (1648637627).

6663281989 is a wasteful number, since it uses less digits than its factorization.

6663281989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725.

The product of its digits is 6718464, while the sum is 58.

The square root of 6663281989 is about 81628.9286282749. The cubic root of 6663281989 is about 1881.7534934811.

The spelling of 6663281989 in words is "six billion, six hundred sixty-three million, two hundred eighty-one thousand, nine hundred eighty-nine".