66980967 has 4 divisors (see below), whose sum is σ = 89307960. Its totient is φ = 44653976.

The previous prime is 66980959. The next prime is 66980993. The reversal of 66980967 is 76908966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66980967 - 2³ = 66980959 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66980957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11163492 + ... + 11163497.

It is an arithmetic number, because the mean of its divisors is an integer number (22326990).

Almost surely, 2^66980967 is an apocalyptic number.

66980967 is a deficient number, since it is larger than the sum of its proper divisors (22326993).

66980967 is a wasteful number, since it uses less digits than its factorization.

66980967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22326992.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 66980967 is about 8184.1900637754. The cubic root of 66980967 is about 406.1163469768.

The spelling of 66980967 in words is "sixty-six million, nine hundred eighty thousand, nine hundred sixty-seven".