66768685 has 8 divisors (see below), whose sum is σ = 80169336. Its totient is φ = 53383680.

The previous prime is 66768661. The next prime is 66768697. The reversal of 66768685 is 58686766.

It can be written as a sum of positive squares in 4 ways, for example, as 866761 + 65901924 = 931^2 + 8118^2 .

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

It is not a de Polignac number, because 66768685 - 2⁹ = 66768173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9957 + ... + 15253.

It is an arithmetic number, because the mean of its divisors is an integer number (10021167).

Almost surely, 2^66768685 is an apocalyptic number.

It is an amenable number.

66768685 is a deficient number, since it is larger than the sum of its proper divisors (13400651).

66768685 is a wasteful number, since it uses less digits than its factorization.

66768685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7823.

The product of its digits is 2903040, while the sum is 52.

The square root of 66768685 is about 8171.2107426011. The cubic root of 66768685 is about 405.6868596614.

The spelling of 66768685 in words is "sixty-six million, seven hundred sixty-eight thousand, six hundred eighty-five".