66622544 has 20 divisors (see below), whose sum is σ = 130268820. Its totient is φ = 33004800.

The previous prime is 66622511. The next prime is 66622573. The reversal of 66622544 is 44522666.

It can be written as a sum of positive squares in 2 ways, for example, as 36240400 + 30382144 = 6020^2 + 5512^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17357 + ... + 20844.

It is an arithmetic number, because the mean of its divisors is an integer number (6513441).

Almost surely, 2^66622544 is an apocalyptic number.

It is an amenable number.

66622544 is a deficient number, since it is larger than the sum of its proper divisors (63646276).

66622544 is a wasteful number, since it uses less digits than its factorization.

66622544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38318 (or 38312 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

The square root of 66622544 is about 8162.2634115789. The cubic root of 66622544 is about 405.3906589724.

The spelling of 66622544 in words is "sixty-six million, six hundred twenty-two thousand, five hundred forty-four".