66666887 has 8 divisors (see below), whose sum is σ = 76286496. Its totient is φ = 57071232.

The previous prime is 66666881. The next prime is 66666913. The reversal of 66666887 is 78866666.

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 66666887 - 2⁴ = 66666871 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 (66666881) 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, 443 + ... + 11555.

It is an arithmetic number, because the mean of its divisors is an integer number (9535812).

Almost surely, 2^66666887 is an apocalyptic number.

66666887 is a deficient number, since it is larger than the sum of its proper divisors (9619609).

66666887 is a wasteful number, since it uses less digits than its factorization.

66666887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11977.

The product of its digits is 3483648, while the sum is 53.

The square root of 66666887 is about 8164.9793018721. The cubic root of 66666887 is about 405.4805797417.

The spelling of 66666887 in words is "sixty-six million, six hundred sixty-six thousand, eight hundred eighty-seven".