66943954 has 64 divisors (see below), whose sum is σ = 133539840. Its totient is φ = 24382080.

The previous prime is 66943927. The next prime is 66943957. The reversal of 66943954 is 45934966.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66943957) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 400779 + ... + 400945.

It is an arithmetic number, because the mean of its divisors is an integer number (2086560).

Almost surely, 2^66943954 is an apocalyptic number.

66943954 is a deficient number, since it is larger than the sum of its proper divisors (66595886).

66943954 is a wasteful number, since it uses less digits than its factorization.

66943954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343.

The product of its digits is 699840, while the sum is 46.

The square root of 66943954 is about 8181.9285012765. The cubic root of 66943954 is about 406.0415279417.

It can be divided in two parts, 6694 and 3954, that added together give a cube (10648 = 22³).

The spelling of 66943954 in words is "sixty-six million, nine hundred forty-three thousand, nine hundred fifty-four".