66693544 has 16 divisors (see below), whose sum is σ = 125176320. Its totient is φ = 33313200.

The previous prime is 66693527. The next prime is 66693547. The reversal of 66693544 is 44539666.

It is a super-2 number, since 2×66693544² = 8896057622559872, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66693544.

It is not an unprimeable number, because it can be changed into a prime (66693547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5587 + ... + 12829.

It is an arithmetic number, because the mean of its divisors is an integer number (7823520).

Almost surely, 2^66693544 is an apocalyptic number.

It is an amenable number.

66693544 is a deficient number, since it is larger than the sum of its proper divisors (58482776).

66693544 is a wasteful number, since it uses less digits than its factorization.

66693544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8400 (or 8396 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

The square root of 66693544 is about 8166.6115372289. The cubic root of 66693544 is about 405.5346168405.

The spelling of 66693544 in words is "sixty-six million, six hundred ninety-three thousand, five hundred forty-four".