6661065439 has 12 divisors (see below), whose sum is σ = 7755636600. Its totient is φ = 5704289808.

The previous prime is 6661065431. The next prime is 6661065469. The reversal of 6661065439 is 9345601666.

It is not a de Polignac number, because 6661065439 - 2³ = 6661065431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661065431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6949 + ... + 115630.

It is an arithmetic number, because the mean of its divisors is an integer number (646303050).

Almost surely, 2^6661065439 is an apocalyptic number.

6661065439 is a deficient number, since it is larger than the sum of its proper divisors (1094571161).

6661065439 is a wasteful number, since it uses less digits than its factorization.

6661065439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123702 (or 123695 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 46.

The square root of 6661065439 is about 81615.3505107955. The cubic root of 6661065439 is about 1881.5448143699.

The spelling of 6661065439 in words is "six billion, six hundred sixty-one million, sixty-five thousand, four hundred thirty-nine".