66443845 has 16 divisors (see below), whose sum is σ = 86083200. Its totient is φ = 48942144.

The previous prime is 66443831. The next prime is 66443857. The reversal of 66443845 is 54834466.

It is a cyclic number.

It is not a de Polignac number, because 66443845 - 2¹⁵ = 66411077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66443798 and 66443807.

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, 30606 + ... + 32704.

It is an arithmetic number, because the mean of its divisors is an integer number (5380200).

Almost surely, 2^66443845 is an apocalyptic number.

66443845 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66443845 is a deficient number, since it is larger than the sum of its proper divisors (19639355).

66443845 is a wasteful number, since it uses less digits than its factorization.

66443845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604.

The product of its digits is 276480, while the sum is 40.

The square root of 66443845 is about 8151.3094040160. The cubic root of 66443845 is about 405.0278800093.

The spelling of 66443845 in words is "sixty-six million, four hundred forty-three thousand, eight hundred forty-five".