66065988 has 24 divisors (see below), whose sum is σ = 154517440. Its totient is φ = 21970080.

The previous prime is 66065977. The next prime is 66066043. The reversal of 66065988 is 88956066.

It is a super-2 number, since 2×66065988² = 8729429540832288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1003 + ... + 11538.

Almost surely, 2^66065988 is an apocalyptic number.

It is an amenable number.

66065988 is an abundant number, since it is smaller than the sum of its proper divisors (88451452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66065988 is a wasteful number, since it uses less digits than its factorization.

66065988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12987 (or 12985 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 66065988 is about 8128.0986706609. The cubic root of 66065988 is about 404.2586407091.

The spelling of 66065988 in words is "sixty-six million, sixty-five thousand, nine hundred eighty-eight".