66689846 has 4 divisors (see below), whose sum is σ = 100034772. Its totient is φ = 33344922.

The previous prime is 66689839. The next prime is 66689849. The reversal of 66689846 is 64898666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66689849) 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, 16672460 + ... + 16672463.

It is an arithmetic number, because the mean of its divisors is an integer number (25008693).

Almost surely, 2^66689846 is an apocalyptic number.

66689846 is a deficient number, since it is larger than the sum of its proper divisors (33344926).

66689846 is a wasteful number, since it uses less digits than its factorization.

66689846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33344925.

The product of its digits is 2985984, while the sum is 53.

The square root of 66689846 is about 8166.3851243987. The cubic root of 66689846 is about 405.5271213887.

The spelling of 66689846 in words is "sixty-six million, six hundred eighty-nine thousand, eight hundred forty-six".