66944964 has 24 divisors (see below), whose sum is σ = 160015968. Its totient is φ = 21770560.

The previous prime is 66944959. The next prime is 66944981. The reversal of 66944964 is 46944966.

It is a super-2 number, since 2×66944964² = 8963256409922592, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 67542 + ... + 68525.

It is an arithmetic number, because the mean of its divisors is an integer number (6667332).

Almost surely, 2^66944964 is an apocalyptic number.

It is an amenable number.

66944964 is an abundant number, since it is smaller than the sum of its proper divisors (93071004).

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

66944964 is a wasteful number, since it uses less digits than its factorization.

66944964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136115 (or 136113 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 48.

The square root of 66944964 is about 8181.9902224337. The cubic root of 66944964 is about 406.0435699478.

The spelling of 66944964 in words is "sixty-six million, nine hundred forty-four thousand, nine hundred sixty-four".