6660512539 has 2 divisors, whose sum is σ = 6660512540. Its totient is φ = 6660512538.

The previous prime is 6660512513. The next prime is 6660512543. The reversal of 6660512539 is 9352150666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6660512539 - 2²³ = 6652123931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6660512495 and 6660512504.

It is not a weakly prime, because it can be changed into another prime (6660512839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330256269 + 3330256270.

It is an arithmetic number, because the mean of its divisors is an integer number (3330256270).

Almost surely, 2^6660512539 is an apocalyptic number.

6660512539 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660512539 is an equidigital number, since it uses as much as digits as its factorization.

6660512539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 43.

The square root of 6660512539 is about 81611.9632100589. The cubic root of 6660512539 is about 1881.4927538839.

The spelling of 6660512539 in words is "six billion, six hundred sixty million, five hundred twelve thousand, five hundred thirty-nine".