6660612139 has 2 divisors, whose sum is σ = 6660612140. Its totient is φ = 6660612138.

The previous prime is 6660612071. The next prime is 6660612157. The reversal of 6660612139 is 9312160666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6660612139 - 2¹³ = 6660603947 is a prime.

It is not a weakly prime, because it can be changed into another prime (6660610139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330306069 + 3330306070.

It is an arithmetic number, because the mean of its divisors is an integer number (3330306070).

Almost surely, 2^6660612139 is an apocalyptic number.

6660612139 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660612139 is an equidigital number, since it uses as much as digits as its factorization.

6660612139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 6660612139 is about 81612.5734124344. The cubic root of 6660612139 is about 1881.5021323285.

The spelling of 6660612139 in words is "six billion, six hundred sixty million, six hundred twelve thousand, one hundred thirty-nine".