66446718 has 16 divisors (see below), whose sum is σ = 143116176. Its totient is φ = 20445120.

The previous prime is 66446713. The next prime is 66446741. The reversal of 66446718 is 81764466.

It is a self number, because there is not a number n which added to its sum of digits gives 66446718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66446713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425863 + ... + 426018.

It is an arithmetic number, because the mean of its divisors is an integer number (8944761).

Almost surely, 2^66446718 is an apocalyptic number.

66446718 is an abundant number, since it is smaller than the sum of its proper divisors (76669458).

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

66446718 is a wasteful number, since it uses less digits than its factorization.

66446718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851899.

The product of its digits is 193536, while the sum is 42.

The square root of 66446718 is about 8151.4856314662. The cubic root of 66446718 is about 405.0337176622.

The spelling of 66446718 in words is "sixty-six million, four hundred forty-six thousand, seven hundred eighteen".