66345544 has 32 divisors (see below), whose sum is σ = 129376800. Its totient is φ = 31870080.

The previous prime is 66345541. The next prime is 66345553. The reversal of 66345544 is 44554366.

66345544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66345541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20467 + ... + 23485.

It is an arithmetic number, because the mean of its divisors is an integer number (4043025).

Almost surely, 2^66345544 is an apocalyptic number.

It is an amenable number.

66345544 is a deficient number, since it is larger than the sum of its proper divisors (63031256).

66345544 is a wasteful number, since it uses less digits than its factorization.

66345544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3133 (or 3129 counting only the distinct ones).

The product of its digits is 172800, while the sum is 37.

The square root of 66345544 is about 8145.2774047297. The cubic root of 66345544 is about 404.8280405985.

The spelling of 66345544 in words is "sixty-six million, three hundred forty-five thousand, five hundred forty-four".