66944 has 16 divisors (see below), whose sum is σ = 133620. Its totient is φ = 33408.

The previous prime is 66943. The next prime is 66947. The reversal of 66944 is 44966.

It is a tau number, because it is divible by the number of its divisors (16).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134 + ... + 389.

2⁶⁶⁹⁴⁴ is an apocalyptic number.

66944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66944 is a deficient number, since it is larger than the sum of its proper divisors (66676).

66944 is an equidigital number, since it uses as much as digits as its factorization.

66944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 525 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 66944 is about 258.7353860607. The cubic root of 66944 is about 40.6041620944.

The spelling of 66944 in words is "sixty-six thousand, nine hundred forty-four".