66312646 has 8 divisors (see below), whose sum is σ = 101345904. Its totient is φ = 32530680.

The previous prime is 66312643. The next prime is 66312667. The reversal of 66312646 is 64621366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66312643) by changing a digit.

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, 312690 + ... + 312901.

It is an arithmetic number, because the mean of its divisors is an integer number (12668238).

Almost surely, 2^66312646 is an apocalyptic number.

66312646 is a deficient number, since it is larger than the sum of its proper divisors (35033258).

66312646 is a wasteful number, since it uses less digits than its factorization.

66312646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625646.

The product of its digits is 31104, while the sum is 34.

The square root of 66312646 is about 8143.2577019274. The cubic root of 66312646 is about 404.7611170647.

The spelling of 66312646 in words is "sixty-six million, three hundred twelve thousand, six hundred forty-six".