66859677 has 12 divisors (see below), whose sum is σ = 97532604. Its totient is φ = 44131200.

The previous prime is 66859673. The next prime is 66859687. The reversal of 66859677 is 77695866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50041476 + 16818201 = 7074^2 + 4101^2 .

It is not a de Polignac number, because 66859677 - 2² = 66859673 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66859673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35868 + ... + 37685.

It is an arithmetic number, because the mean of its divisors is an integer number (8127717).

Almost surely, 2^66859677 is an apocalyptic number.

It is an amenable number.

66859677 is a deficient number, since it is larger than the sum of its proper divisors (30672927).

66859677 is a wasteful number, since it uses less digits than its factorization.

66859677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73660 (or 73657 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The square root of 66859677 is about 8176.7766876686. The cubic root of 66859677 is about 405.8710652890.

The spelling of 66859677 in words is "sixty-six million, eight hundred fifty-nine thousand, six hundred seventy-seven".