66680977 has 8 divisors (see below), whose sum is σ = 73664640. Its totient is φ = 59850960.

The previous prime is 66680959. The next prime is 66680981. The reversal of 66680977 is 77908666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66680977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66680977.

It is not an unprimeable number, because it can be changed into a prime (66680377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37498 + ... + 39235.

It is an arithmetic number, because the mean of its divisors is an integer number (9208080).

Almost surely, 2^66680977 is an apocalyptic number.

It is an amenable number.

66680977 is a deficient number, since it is larger than the sum of its proper divisors (6983663).

66680977 is a wasteful number, since it uses less digits than its factorization.

66680977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76823.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 66680977 is about 8165.8420876233. The cubic root of 66680977 is about 405.5091437419.

The spelling of 66680977 in words is "sixty-six million, six hundred eighty thousand, nine hundred seventy-seven".