66015140 has 12 divisors (see below), whose sum is σ = 138631836. Its totient is φ = 26406048.

The previous prime is 66015137. The next prime is 66015179. The reversal of 66015140 is 4151066.

It can be written as a sum of positive squares in 2 ways, for example, as 39037504 + 26977636 = 6248^2 + 5194^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650359 + ... + 1650398.

It is an arithmetic number, because the mean of its divisors is an integer number (11552653).

Almost surely, 2^66015140 is an apocalyptic number.

It is an amenable number.

66015140 is an abundant number, since it is smaller than the sum of its proper divisors (72616696).

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

66015140 is a wasteful number, since it uses less digits than its factorization.

66015140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300766 (or 3300764 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 66015140 is about 8124.9701537913. The cubic root of 66015140 is about 404.1549008986.

The spelling of 66015140 in words is "sixty-six million, fifteen thousand, one hundred forty".