66511331 has 8 divisors (see below), whose sum is σ = 69617184. Its totient is φ = 63423360.

The previous prime is 66511283. The next prime is 66511363. The reversal of 66511331 is 13311566.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66511331 is a prime.

It is a super-2 number, since 2×66511331² = 8847514302783122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66511331.

It is not an unprimeable number, because it can be changed into a prime (66511031) 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, 3461 + ... + 12041.

It is an arithmetic number, because the mean of its divisors is an integer number (8702148).

Almost surely, 2^66511331 is an apocalyptic number.

66511331 is a deficient number, since it is larger than the sum of its proper divisors (3105853).

66511331 is a wasteful number, since it uses less digits than its factorization.

66511331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8941.

The product of its digits is 1620, while the sum is 26.

The square root of 66511331 is about 8155.4479337434. The cubic root of 66511331 is about 405.1649604897.

Adding to 66511331 its reverse (13311566), we get a palindrome (79822897).

The spelling of 66511331 in words is "sixty-six million, five hundred eleven thousand, three hundred thirty-one".