66385442 has 16 divisors (see below), whose sum is σ = 106527960. Its totient is φ = 30916608.

The previous prime is 66385433. The next prime is 66385447. The reversal of 66385442 is 24458366.

It can be written as a sum of positive squares in 4 ways, for example, as 66275881 + 109561 = 8141^2 + 331^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66385396 and 66385405.

It is not an unprimeable number, because it can be changed into a prime (66385447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6767 + ... + 13362.

Almost surely, 2^66385442 is an apocalyptic number.

66385442 is a deficient number, since it is larger than the sum of its proper divisors (40142518).

66385442 is a wasteful number, since it uses less digits than its factorization.

66385442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20245.

The product of its digits is 138240, while the sum is 38.

The square root of 66385442 is about 8147.7261858754. The cubic root of 66385442 is about 404.9091743695.

The spelling of 66385442 in words is "sixty-six million, three hundred eighty-five thousand, four hundred forty-two".