66806697 has 8 divisors (see below), whose sum is σ = 92948544. Its totient is φ = 42601328.

The previous prime is 66806689. The next prime is 66806711. The reversal of 66806697 is 79660866.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66806697 - 2³ = 66806689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66806687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484038 + ... + 484175.

It is an arithmetic number, because the mean of its divisors is an integer number (11618568).

Almost surely, 2^66806697 is an apocalyptic number.

It is an amenable number.

66806697 is a deficient number, since it is larger than the sum of its proper divisors (26141847).

66806697 is a wasteful number, since it uses less digits than its factorization.

66806697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968239.

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 66806697 is about 8173.5363827416. The cubic root of 66806697 is about 405.7638320894.

The spelling of 66806697 in words is "sixty-six million, eight hundred six thousand, six hundred ninety-seven".