66680697 has 8 divisors (see below), whose sum is σ = 91310656. Its totient is φ = 43252272.

The previous prime is 66680693. The next prime is 66680711. The reversal of 66680697 is 79608666.

It is a happy number.

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

It is not a de Polignac number, because 66680697 - 2² = 66680693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66680693) 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 7 ways as a sum of consecutive naturals, for example, 300253 + ... + 300474.

It is an arithmetic number, because the mean of its divisors is an integer number (11413832).

Almost surely, 2^66680697 is an apocalyptic number.

It is an amenable number.

66680697 is a deficient number, since it is larger than the sum of its proper divisors (24629959).

66680697 is a wasteful number, since it uses less digits than its factorization.

66680697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600767.

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

The square root of 66680697 is about 8165.8249430171. The cubic root of 66680697 is about 405.5085761501.

The spelling of 66680697 in words is "sixty-six million, six hundred eighty thousand, six hundred ninety-seven".