66889642 has 8 divisors (see below), whose sum is σ = 101308896. Its totient is φ = 33120012.

The previous prime is 66889621. The next prime is 66889663. The reversal of 66889642 is 24698866.

It is an interprime number because it is at equal distance from previous prime (66889621) and next prime (66889663).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 162148 + ... + 162559.

It is an arithmetic number, because the mean of its divisors is an integer number (12663612).

Almost surely, 2^66889642 is an apocalyptic number.

66889642 is a deficient number, since it is larger than the sum of its proper divisors (34419254).

66889642 is a wasteful number, since it uses less digits than its factorization.

66889642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324812.

The product of its digits is 995328, while the sum is 49.

The square root of 66889642 is about 8178.6088059034. The cubic root of 66889642 is about 405.9316903202.

The spelling of 66889642 in words is "sixty-six million, eight hundred eighty-nine thousand, six hundred forty-two".