66278811 has 8 divisors (see below), whose sum is σ = 88427520. Its totient is φ = 44157992.

The previous prime is 66278791. The next prime is 66278813. The reversal of 66278811 is 11887266.

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 66278811 - 2¹⁵ = 66246043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66278811.

It is not an unprimeable number, because it can be changed into a prime (66278813) 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, 591 + ... + 11528.

It is an arithmetic number, because the mean of its divisors is an integer number (11053440).

Almost surely, 2^66278811 is an apocalyptic number.

66278811 is a deficient number, since it is larger than the sum of its proper divisors (22148709).

66278811 is a wasteful number, since it uses less digits than its factorization.

66278811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13945.

The product of its digits is 32256, while the sum is 39.

The square root of 66278811 is about 8141.1799513338. The cubic root of 66278811 is about 404.6922643238.

The spelling of 66278811 in words is "sixty-six million, two hundred seventy-eight thousand, eight hundred eleven".