66437944 has 24 divisors (see below), whose sum is σ = 125881560. Its totient is φ = 32871984.

The previous prime is 66437939. The next prime is 66437947. The reversal of 66437944 is 44973466.

It is a self number, because there is not a number n which added to its sum of digits gives 66437944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66437947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 297817 + ... + 298039.

It is an arithmetic number, because the mean of its divisors is an integer number (5245065).

Almost surely, 2^66437944 is an apocalyptic number.

It is an amenable number.

66437944 is a deficient number, since it is larger than the sum of its proper divisors (59443616).

66437944 is a wasteful number, since it uses less digits than its factorization.

66437944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619 (or 392 counting only the distinct ones).

The product of its digits is 435456, while the sum is 43.

The square root of 66437944 is about 8150.9474295937. The cubic root of 66437944 is about 405.0158892308.

The spelling of 66437944 in words is "sixty-six million, four hundred thirty-seven thousand, nine hundred forty-four".