66816674 has 16 divisors (see below), whose sum is σ = 102846240. Its totient is φ = 32544960.

The previous prime is 66816671. The next prime is 66816677. The reversal of 66816674 is 47661866.

It is an interprime number because it is at equal distance from previous prime (66816671) and next prime (66816677).

It is not an unprimeable number, because it can be changed into a prime (66816671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10829 + ... + 15839.

It is an arithmetic number, because the mean of its divisors is an integer number (6427890).

Almost surely, 2^66816674 is an apocalyptic number.

66816674 is a deficient number, since it is larger than the sum of its proper divisors (36029566).

66816674 is a wasteful number, since it uses less digits than its factorization.

66816674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5185.

The product of its digits is 290304, while the sum is 44.

The square root of 66816674 is about 8174.1466832936. The cubic root of 66816674 is about 405.7840301855.

The spelling of 66816674 in words is "sixty-six million, eight hundred sixteen thousand, six hundred seventy-four".