66701191 has 8 divisors (see below), whose sum is σ = 70686000. Its totient is φ = 62763840.

The previous prime is 66701179. The next prime is 66701227. The reversal of 66701191 is 19110766.

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

It is not a de Polignac number, because 66701191 - 2¹³ = 66692999 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66701101) 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, 8950 + ... + 14611.

It is an arithmetic number, because the mean of its divisors is an integer number (8835750).

Almost surely, 2^66701191 is an apocalyptic number.

66701191 is a deficient number, since it is larger than the sum of its proper divisors (3984809).

66701191 is a wasteful number, since it uses less digits than its factorization.

66701191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23729.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 66701191 is about 8167.0797106432. The cubic root of 66701191 is about 405.5501156155.

The spelling of 66701191 in words is "sixty-six million, seven hundred one thousand, one hundred ninety-one".