66448570 has 16 divisors (see below), whose sum is σ = 123732360. Its totient is φ = 25662784.

The previous prime is 66448561. The next prime is 66448579. The reversal of 66448570 is 7584466.

It is an interprime number because it is at equal distance from previous prime (66448561) and next prime (66448579).

It can be written as a sum of positive squares in 4 ways, for example, as 45954841 + 20493729 = 6779^2 + 4527^2 .

It is not an unprimeable number, because it can be changed into a prime (66448579) 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, 114277 + ... + 114856.

Almost surely, 2^66448570 is an apocalyptic number.

66448570 is a deficient number, since it is larger than the sum of its proper divisors (57283790).

66448570 is a wasteful number, since it uses less digits than its factorization.

66448570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229169.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 66448570 is about 8151.5992295991. The cubic root of 66448570 is about 405.0374806546.

The spelling of 66448570 in words is "sixty-six million, four hundred forty-eight thousand, five hundred seventy".