66880397 has 8 divisors (see below), whose sum is σ = 70886016. Its totient is φ = 62882752.

The previous prime is 66880391. The next prime is 66880417. The reversal of 66880397 is 79308866.

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 66880397 - 2⁸ = 66880141 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 (66880391) 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, 31388 + ... + 33450.

It is an arithmetic number, because the mean of its divisors is an integer number (8860752).

Almost surely, 2^66880397 is an apocalyptic number.

It is an amenable number.

66880397 is a deficient number, since it is larger than the sum of its proper divisors (4005619).

66880397 is a wasteful number, since it uses less digits than its factorization.

66880397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 66880397 is about 8178.0435924492. The cubic root of 66880397 is about 405.9129878162.

The spelling of 66880397 in words is "sixty-six million, eight hundred eighty thousand, three hundred ninety-seven".