66443477 has 4 divisors (see below), whose sum is σ = 67857216. Its totient is φ = 65029740.

The previous prime is 66443467. The next prime is 66443491. The reversal of 66443477 is 77434466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66443477 - 2⁶ = 66443413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66443407) 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 3 ways as a sum of consecutive naturals, for example, 706799 + ... + 706892.

It is an arithmetic number, because the mean of its divisors is an integer number (16964304).

Almost surely, 2^66443477 is an apocalyptic number.

It is an amenable number.

66443477 is a deficient number, since it is larger than the sum of its proper divisors (1413739).

66443477 is a wasteful number, since it uses less digits than its factorization.

66443477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413738.

The product of its digits is 338688, while the sum is 41.

The square root of 66443477 is about 8151.2868309243. The cubic root of 66443477 is about 405.0271322574.

The spelling of 66443477 in words is "sixty-six million, four hundred forty-three thousand, four hundred seventy-seven".