66064191 has 4 divisors (see below), whose sum is σ = 88085592. Its totient is φ = 44042792.

The previous prime is 66064189. The next prime is 66064213. The reversal of 66064191 is 19146066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66064191 - 2¹ = 66064189 is a prime.

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 (66064171) 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, 11010696 + ... + 11010701.

It is an arithmetic number, because the mean of its divisors is an integer number (22021398).

Almost surely, 2^66064191 is an apocalyptic number.

66064191 is a deficient number, since it is larger than the sum of its proper divisors (22021401).

66064191 is a wasteful number, since it uses less digits than its factorization.

66064191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22021400.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 66064191 is about 8127.9881274520. The cubic root of 66064191 is about 404.2549753871.

The spelling of 66064191 in words is "sixty-six million, sixty-four thousand, one hundred ninety-one".