66519850 has 12 divisors (see below), whose sum is σ = 123727014. Its totient is φ = 26607920.

The previous prime is 66519833. The next prime is 66519857. The reversal of 66519850 is 5891566.

It can be written as a sum of positive squares in 3 ways, for example, as 56235001 + 10284849 = 7499^2 + 3207^2 .

It is not an unprimeable number, because it can be changed into a prime (66519857) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665149 + ... + 665248.

Almost surely, 2^66519850 is an apocalyptic number.

66519850 is a deficient number, since it is larger than the sum of its proper divisors (57207164).

66519850 is a wasteful number, since it uses less digits than its factorization.

66519850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330409 (or 1330404 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 66519850 is about 8155.9702059289. The cubic root of 66519850 is about 405.1822580584.

The spelling of 66519850 in words is "sixty-six million, five hundred nineteen thousand, eight hundred fifty".