66765713 has 8 divisors (see below), whose sum is σ = 78078528. Its totient is φ = 55896624.

The previous prime is 66765697. The next prime is 66765739. The reversal of 66765713 is 31756766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66765713 - 2⁴ = 66765697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66765763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110606 + ... + 111207.

It is an arithmetic number, because the mean of its divisors is an integer number (9759816).

Almost surely, 2^66765713 is an apocalyptic number.

It is an amenable number.

66765713 is a deficient number, since it is larger than the sum of its proper divisors (11312815).

66765713 is a wasteful number, since it uses less digits than its factorization.

66765713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221863.

The product of its digits is 158760, while the sum is 41.

The square root of 66765713 is about 8171.0288825827. The cubic root of 66765713 is about 405.6808402765.

The spelling of 66765713 in words is "sixty-six million, seven hundred sixty-five thousand, seven hundred thirteen".