66437444 has 6 divisors (see below), whose sum is σ = 116265534. Its totient is φ = 33218720.

The previous prime is 66437431. The next prime is 66437447. The reversal of 66437444 is 44473466.

66437444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 53114944 + 13322500 = 7288^2 + 3650^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66437398 and 66437407.

It is not an unprimeable number, because it can be changed into a prime (66437447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8304677 + ... + 8304684.

It is an arithmetic number, because the mean of its divisors is an integer number (19377589).

Almost surely, 2^66437444 is an apocalyptic number.

It is an amenable number.

66437444 is a deficient number, since it is larger than the sum of its proper divisors (49828090).

66437444 is a wasteful number, since it uses less digits than its factorization.

66437444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16609365 (or 16609363 counting only the distinct ones).

The product of its digits is 193536, while the sum is 38.

The square root of 66437444 is about 8150.9167582549. The cubic root of 66437444 is about 405.0148732027.

The spelling of 66437444 in words is "sixty-six million, four hundred thirty-seven thousand, four hundred forty-four".