66313191 has 8 divisors (see below), whose sum is σ = 101048704. Its totient is φ = 37893240.

The previous prime is 66313187. The next prime is 66313201. The reversal of 66313191 is 19131366.

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

It is not a de Polignac number, because 66313191 - 2² = 66313187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66313171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1578865 + ... + 1578906.

It is an arithmetic number, because the mean of its divisors is an integer number (12631088).

Almost surely, 2^66313191 is an apocalyptic number.

66313191 is a deficient number, since it is larger than the sum of its proper divisors (34735513).

66313191 is a wasteful number, since it uses less digits than its factorization.

66313191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157781.

The product of its digits is 2916, while the sum is 30.

The square root of 66313191 is about 8143.2911651248. The cubic root of 66313191 is about 404.7622259241.

The spelling of 66313191 in words is "sixty-six million, three hundred thirteen thousand, one hundred ninety-one".