66917086 has 4 divisors (see below), whose sum is σ = 100375632. Its totient is φ = 33458542.

The previous prime is 66917077. The next prime is 66917089. The reversal of 66917086 is 68071966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68071966 = 2 ⋅34035983.

It is a super-3 number, since 3×66917086³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66917089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16729270 + ... + 16729273.

It is an arithmetic number, because the mean of its divisors is an integer number (25093908).

Almost surely, 2^66917086 is an apocalyptic number.

66917086 is a deficient number, since it is larger than the sum of its proper divisors (33458546).

66917086 is a wasteful number, since it uses less digits than its factorization.

66917086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33458545.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 66917086 is about 8180.2864253032. The cubic root of 66917086 is about 405.9871989946.

The spelling of 66917086 in words is "sixty-six million, nine hundred seventeen thousand, eighty-six".