66866445 has 16 divisors (see below), whose sum is σ = 118873920. Its totient is φ = 35662032.

The previous prime is 66866417. The next prime is 66866483. The reversal of 66866445 is 54466866.

It is not a de Polignac number, because 66866445 - 2⁵ = 66866413 is a prime.

It is a super-2 number, since 2×66866445² = 8942242933876050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66866445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247519 + ... + 247788.

It is an arithmetic number, because the mean of its divisors is an integer number (7429620).

Almost surely, 2^66866445 is an apocalyptic number.

It is an amenable number.

66866445 is a deficient number, since it is larger than the sum of its proper divisors (52007475).

66866445 is a wasteful number, since it uses less digits than its factorization.

66866445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495321 (or 495315 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 66866445 is about 8177.1905322060. The cubic root of 66866445 is about 405.8847598545.

It can be divided in two parts, 6686 and 6445, that added together give a palindrome (13131).

The spelling of 66866445 in words is "sixty-six million, eight hundred sixty-six thousand, four hundred forty-five".