66079891 has 8 divisors (see below), whose sum is σ = 71438480. Its totient is φ = 60909408.

The previous prime is 66079877. The next prime is 66079903. The reversal of 66079891 is 19897066.

66079891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 66079891 - 2⁵ = 66079859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66079831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46296 + ... + 47701.

It is an arithmetic number, because the mean of its divisors is an integer number (8929810).

Almost surely, 2^66079891 is an apocalyptic number.

66079891 is a deficient number, since it is larger than the sum of its proper divisors (5358589).

66079891 is a wasteful number, since it uses less digits than its factorization.

66079891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94053.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 66079891 is about 8128.9538687337. The cubic root of 66079891 is about 404.2869962662.

The spelling of 66079891 in words is "sixty-six million, seventy-nine thousand, eight hundred ninety-one".