66723018 has 16 divisors (see below), whose sum is σ = 134036640. Its totient is φ = 22142576.

The previous prime is 66723017. The next prime is 66723049. The reversal of 66723018 is 81032766.

It is a super-2 number, since 2×66723018² = 8903922262056648, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66723018.

It is not an unprimeable number, because it can be changed into a prime (66723017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23133 + ... + 25856.

It is an arithmetic number, because the mean of its divisors is an integer number (8377290).

Almost surely, 2^66723018 is an apocalyptic number.

66723018 is an abundant number, since it is smaller than the sum of its proper divisors (67313622).

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

66723018 is a wasteful number, since it uses less digits than its factorization.

66723018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49221.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 66723018 is about 8168.4158806956. The cubic root of 66723018 is about 405.5943475942.

The spelling of 66723018 in words is "sixty-six million, seven hundred twenty-three thousand, eighteen".