66448937 has 4 divisors (see below), whose sum is σ = 70357716. Its totient is φ = 62540160.

The previous prime is 66448919. The next prime is 66448939. The reversal of 66448937 is 73984466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54449641 + 11999296 = 7379^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 66448937 - 2¹² = 66444841 is a prime.

It is a super-2 number, since 2×66448937² = 8830922456859938, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66448891 and 66448900.

It is not an unprimeable number, because it can be changed into a prime (66448939) 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, 1954364 + ... + 1954397.

It is an arithmetic number, because the mean of its divisors is an integer number (17589429).

Almost surely, 2^66448937 is an apocalyptic number.

It is an amenable number.

66448937 is a deficient number, since it is larger than the sum of its proper divisors (3908779).

66448937 is a wasteful number, since it uses less digits than its factorization.

66448937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3908778.

The product of its digits is 870912, while the sum is 47.

The square root of 66448937 is about 8151.6217404882. The cubic root of 66448937 is about 405.0382263365.

The spelling of 66448937 in words is "sixty-six million, four hundred forty-eight thousand, nine hundred thirty-seven".