66544467 has 16 divisors (see below), whose sum is σ = 98239872. Its totient is φ = 39726720.

The previous prime is 66544459. The next prime is 66544483. The reversal of 66544467 is 76444566.

It is a happy number.

It is not a de Polignac number, because 66544467 - 2³ = 66544459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66544487) 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 15 ways as a sum of consecutive naturals, for example, 12838 + ... + 17259.

It is an arithmetic number, because the mean of its divisors is an integer number (6139992).

Almost surely, 2^66544467 is an apocalyptic number.

66544467 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

66544467 is a deficient number, since it is larger than the sum of its proper divisors (31695405).

66544467 is a wasteful number, since it uses less digits than its factorization.

66544467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30178.

The product of its digits is 483840, while the sum is 42.

The square root of 66544467 is about 8157.4792062254. The cubic root of 66544467 is about 405.2322338250.

Subtracting 66544467 from its reverse (76444566), we obtain a palindrome (9900099).

The spelling of 66544467 in words is "sixty-six million, five hundred forty-four thousand, four hundred sixty-seven".