66481749 has 8 divisors (see below), whose sum is σ = 98491520. Its totient is φ = 44321148.

The previous prime is 66481733. The next prime is 66481759. The reversal of 66481749 is 94718466.

It is not a de Polignac number, because 66481749 - 2⁴ = 66481733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66481729) 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 7 ways as a sum of consecutive naturals, for example, 1231117 + ... + 1231170.

It is an arithmetic number, because the mean of its divisors is an integer number (12311440).

Almost surely, 2^66481749 is an apocalyptic number.

It is an amenable number.

66481749 is a deficient number, since it is larger than the sum of its proper divisors (32009771).

66481749 is a wasteful number, since it uses less digits than its factorization.

66481749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462296 (or 2462290 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 66481749 is about 8153.6340977505. The cubic root of 66481749 is about 405.1048836725.

The spelling of 66481749 in words is "sixty-six million, four hundred eighty-one thousand, seven hundred forty-nine".