66280138 has 12 divisors (see below), whose sum is σ = 102944790. Its totient is φ = 31967376.

The previous prime is 66280111. The next prime is 66280163. The reversal of 66280138 is 83108266.

It can be written as a sum of positive squares in 3 ways, for example, as 55606849 + 10673289 = 7457^2 + 3267^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61468 + ... + 62536.

Almost surely, 2^66280138 is an apocalyptic number.

66280138 is a deficient number, since it is larger than the sum of its proper divisors (36664652).

66280138 is an equidigital number, since it uses as much as digits as its factorization.

66280138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 66280138 is about 8141.2614501685. The cubic root of 66280138 is about 404.6949651520.

The spelling of 66280138 in words is "sixty-six million, two hundred eighty thousand, one hundred thirty-eight".