66173118 has 16 divisors (see below), whose sum is σ = 144377856. Its totient is φ = 20052440.

The previous prime is 66173117. The next prime is 66173119. The reversal of 66173118 is 81137166.

It is an interprime number because it is at equal distance from previous prime (66173117) and next prime (66173119).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66173117) 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 7 ways as a sum of consecutive naturals, for example, 501246 + ... + 501377.

It is an arithmetic number, because the mean of its divisors is an integer number (9023616).

Almost surely, 2^66173118 is an apocalyptic number.

66173118 is an abundant number, since it is smaller than the sum of its proper divisors (78204738).

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

66173118 is a wasteful number, since it uses less digits than its factorization.

66173118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002639.

The product of its digits is 6048, while the sum is 33.

The square root of 66173118 is about 8134.6861033478. The cubic root of 66173118 is about 404.4770326613.

The spelling of 66173118 in words is "sixty-six million, one hundred seventy-three thousand, one hundred eighteen".