66820316 has 12 divisors (see below), whose sum is σ = 116997888. Its totient is φ = 33392352.

The previous prime is 66820309. The next prime is 66820343. The reversal of 66820316 is 61302866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7640 + ... + 13856.

It is an arithmetic number, because the mean of its divisors is an integer number (9749824).

Almost surely, 2^66820316 is an apocalyptic number.

It is an amenable number.

66820316 is a deficient number, since it is larger than the sum of its proper divisors (50177572).

66820316 is a wasteful number, since it uses less digits than its factorization.

66820316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8908 (or 8906 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 66820316 is about 8174.3694558051. The cubic root of 66820316 is about 405.7914027892.

The spelling of 66820316 in words is "sixty-six million, eight hundred twenty thousand, three hundred sixteen".