66994 has 16 divisors (see below), whose sum is σ = 110880. Its totient is φ = 30240.

The previous prime is 66977. The next prime is 67003. The reversal of 66994 is 49966.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1537 + ... + 1579.

It is an arithmetic number, because the mean of its divisors is an integer number (6930).

2⁶⁶⁹⁹⁴ is an apocalyptic number.

66994 is the 164-th heptagonal number.

66994 is a deficient number, since it is larger than the sum of its proper divisors (43886).

66994 is a wasteful number, since it uses less digits than its factorization.

66994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105.

The product of its digits is 11664, while the sum is 34.

The square root of 66994 is about 258.8319918403. The cubic root of 66994 is about 40.6142685658.

It can be divided in two parts, 6699 and 4, that multiplied together give a triangular number (26796 = T₂₃₁).

The spelling of 66994 in words is "sixty-six thousand, nine hundred ninety-four".