66312971 has 8 divisors (see below), whose sum is σ = 70333920. Its totient is φ = 62305408.

The previous prime is 66312959. The next prime is 66312977. The reversal of 66312971 is 17921366.

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

It is not a de Polignac number, because 66312971 - 2¹⁸ = 66050827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66312977) 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 7 ways as a sum of consecutive naturals, for example, 7985 + ... + 14013.

It is an arithmetic number, because the mean of its divisors is an integer number (8791740).

Almost surely, 2^66312971 is an apocalyptic number.

66312971 is a deficient number, since it is larger than the sum of its proper divisors (4020949).

66312971 is a wasteful number, since it uses less digits than its factorization.

66312971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6693.

The product of its digits is 13608, while the sum is 35.

The square root of 66312971 is about 8143.2776570617. The cubic root of 66312971 is about 404.7617783118.

The spelling of 66312971 in words is "sixty-six million, three hundred twelve thousand, nine hundred seventy-one".