66672918 has 24 divisors (see below), whose sum is σ = 155570688. Its totient is φ = 20514672.

The previous prime is 66672899. The next prime is 66672923. The reversal of 66672918 is 81927666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142230 + ... + 142697.

It is an arithmetic number, because the mean of its divisors is an integer number (6482112).

Almost surely, 2^66672918 is an apocalyptic number.

66672918 is an abundant number, since it is smaller than the sum of its proper divisors (88897770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66672918 is a wasteful number, since it uses less digits than its factorization.

66672918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284948 (or 284945 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 66672918 is about 8165.3486147255. The cubic root of 66672918 is about 405.4928065995.

The spelling of 66672918 in words is "sixty-six million, six hundred seventy-two thousand, nine hundred eighteen".