66286791 has 24 divisors (see below), whose sum is σ = 103862304. Its totient is φ = 40573440.

The previous prime is 66286789. The next prime is 66286799. The reversal of 66286791 is 19768266.

It is not a de Polignac number, because 66286791 - 2¹ = 66286789 is a prime.

It is a super-2 number, since 2×66286791² = 8787877322155362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66286799) 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 23 ways as a sum of consecutive naturals, for example, 990 + ... + 11556.

It is an arithmetic number, because the mean of its divisors is an integer number (4327596).

Almost surely, 2^66286791 is an apocalyptic number.

66286791 is a deficient number, since it is larger than the sum of its proper divisors (37575513).

66286791 is a wasteful number, since it uses less digits than its factorization.

66286791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10631 (or 10628 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 66286791 is about 8141.6700375292. The cubic root of 66286791 is about 404.7085053849.

The spelling of 66286791 in words is "sixty-six million, two hundred eighty-six thousand, seven hundred ninety-one".