66897677 has 8 divisors (see below), whose sum is σ = 83404992. Its totient is φ = 52128000.

The previous prime is 66897673. The next prime is 66897679. The reversal of 66897677 is 77679866.

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 66897677 - 2² = 66897673 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66897673) 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, 434324 + ... + 434477.

It is an arithmetic number, because the mean of its divisors is an integer number (10425624).

Almost surely, 2^66897677 is an apocalyptic number.

It is an amenable number.

66897677 is a deficient number, since it is larger than the sum of its proper divisors (16507315).

66897677 is a wasteful number, since it uses less digits than its factorization.

66897677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868819.

The product of its digits is 5334336, while the sum is 56.

The square root of 66897677 is about 8179.1000116150. The cubic root of 66897677 is about 405.9479436117.

The spelling of 66897677 in words is "sixty-six million, eight hundred ninety-seven thousand, six hundred seventy-seven".