66839544 has 48 divisors (see below), whose sum is σ = 185242200. Its totient is φ = 21760704.

The previous prime is 66839527. The next prime is 66839561. The reversal of 66839544 is 44593866.

It is an interprime number because it is at equal distance from previous prime (66839527) and next prime (66839561).

It is a self number, because there is not a number n which added to its sum of digits gives 66839544.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7699 + ... + 13890.

Almost surely, 2^66839544 is an apocalyptic number.

It is an amenable number.

66839544 is an abundant number, since it is smaller than the sum of its proper divisors (118402656).

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

66839544 is a wasteful number, since it uses less digits than its factorization.

66839544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21644 (or 21637 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 66839544 is about 8175.5454863880. The cubic root of 66839544 is about 405.8303221342.

The spelling of 66839544 in words is "sixty-six million, eight hundred thirty-nine thousand, five hundred forty-four".