66668976 has 60 divisors (see below), whose sum is σ = 203547240. Its totient is φ = 20202240.

The previous prime is 66668957. The next prime is 66668977. The reversal of 66668976 is 67986666.

It is not an unprimeable number, because it can be changed into a prime (66668977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19461 + ... + 22628.

It is an arithmetic number, because the mean of its divisors is an integer number (3392454).

Almost surely, 2^66668976 is an apocalyptic number.

66668976 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

66668976 is an abundant number, since it is smaller than the sum of its proper divisors (136878264).

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

66668976 is a wasteful number, since it uses less digits than its factorization.

66668976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42114 (or 42105 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 66668976 is about 8165.1072252604. The cubic root of 66668976 is about 405.4848149281.

The spelling of 66668976 in words is "sixty-six million, six hundred sixty-eight thousand, nine hundred seventy-six".