66671079 has 4 divisors (see below), whose sum is σ = 88894776. Its totient is φ = 44447384.

The previous prime is 66671053. The next prime is 66671081. The reversal of 66671079 is 97017666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66671079 - 2⁵ = 66671047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66671079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66671039) 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 in 3 ways as a sum of consecutive naturals, for example, 11111844 + ... + 11111849.

It is an arithmetic number, because the mean of its divisors is an integer number (22223694).

Almost surely, 2^66671079 is an apocalyptic number.

66671079 is a deficient number, since it is larger than the sum of its proper divisors (22223697).

66671079 is a wasteful number, since it uses less digits than its factorization.

66671079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22223696.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 66671079 is about 8165.2360039377. The cubic root of 66671079 is about 405.4890784084.

The spelling of 66671079 in words is "sixty-six million, six hundred seventy-one thousand, seventy-nine".