66312001 has 4 divisors (see below), whose sum is σ = 75785152. Its totient is φ = 56838852.

The previous prime is 66311981. The next prime is 66312023. The reversal of 66312001 is 10021366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66312001 - 2⁹ = 66311489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66312001.

It is not an unprimeable number, because it can be changed into a prime (66312041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4736565 + ... + 4736578.

It is an arithmetic number, because the mean of its divisors is an integer number (18946288).

Almost surely, 2^66312001 is an apocalyptic number.

It is an amenable number.

66312001 is a deficient number, since it is larger than the sum of its proper divisors (9473151).

66312001 is an equidigital number, since it uses as much as digits as its factorization.

66312001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473150.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 66312001 is about 8143.2180985161. The cubic root of 66312001 is about 404.7598047369.

Adding to 66312001 its reverse (10021366), we get a palindrome (76333367).

The spelling of 66312001 in words is "sixty-six million, three hundred twelve thousand, one".