6663739 has 2 divisors, whose sum is σ = 6663740. Its totient is φ = 6663738.

The previous prime is 6663731. The next prime is 6663749. The reversal of 6663739 is 9373666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6663739 - 2³ = 6663731 is a prime.

It is not a weakly prime, because it can be changed into another prime (6663731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331869 + 3331870.

It is an arithmetic number, because the mean of its divisors is an integer number (3331870).

Almost surely, 2^6663739 is an apocalyptic number.

6663739 is a deficient number, since it is larger than the sum of its proper divisors (1).

6663739 is an equidigital number, since it uses as much as digits as its factorization.

6663739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 40.

The square root of 6663739 is about 2581.4218950028. The cubic root of 6663739 is about 188.1796513442.

The spelling of 6663739 in words is "six million, six hundred sixty-three thousand, seven hundred thirty-nine".