66191344 has 20 divisors (see below), whose sum is σ = 130350040. Its totient is φ = 32552640.

The previous prime is 66191327. The next prime is 66191351. The reversal of 66191344 is 44319166.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32934 + ... + 34885.

It is an arithmetic number, because the mean of its divisors is an integer number (6517502).

Almost surely, 2^66191344 is an apocalyptic number.

It is an amenable number.

66191344 is a deficient number, since it is larger than the sum of its proper divisors (64158696).

66191344 is a wasteful number, since it uses less digits than its factorization.

66191344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67888 (or 67882 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 66191344 is about 8135.8062907127. The cubic root of 66191344 is about 404.5141641627.

The spelling of 66191344 in words is "sixty-six million, one hundred ninety-one thousand, three hundred forty-four".