66980207 has 6 divisors (see below), whose sum is σ = 77915808. Its totient is φ = 57411564.

The previous prime is 66980203. The next prime is 66980219. The reversal of 66980207 is 70208966.

It is not a de Polignac number, because 66980207 - 2² = 66980203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66980203) 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 5 ways as a sum of consecutive naturals, for example, 683423 + ... + 683520.

It is an arithmetic number, because the mean of its divisors is an integer number (12985968).

Almost surely, 2^66980207 is an apocalyptic number.

66980207 is a deficient number, since it is larger than the sum of its proper divisors (10935601).

66980207 is a wasteful number, since it uses less digits than its factorization.

66980207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366957 (or 1366950 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 66980207 is about 8184.1436326594. The cubic root of 66980207 is about 406.1148109704.

The spelling of 66980207 in words is "sixty-six million, nine hundred eighty thousand, two hundred seven".