66444477 has 16 divisors (see below), whose sum is σ = 99005760. Its totient is φ = 39286400.

The previous prime is 66444467. The next prime is 66444479. The reversal of 66444477 is 77444466.

It is a cyclic number.

It is not a de Polignac number, because 66444477 - 2⁴ = 66444461 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66444479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23202 + ... + 25907.

It is an arithmetic number, because the mean of its divisors is an integer number (6187860).

Almost surely, 2^66444477 is an apocalyptic number.

It is an amenable number.

66444477 is a deficient number, since it is larger than the sum of its proper divisors (32561283).

66444477 is a wasteful number, since it uses less digits than its factorization.

66444477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49164.

The product of its digits is 451584, while the sum is 42.

The square root of 66444477 is about 8151.3481707016. The cubic root of 66444477 is about 405.0291641855.

The spelling of 66444477 in words is "sixty-six million, four hundred forty-four thousand, four hundred seventy-seven".