66771140 has 12 divisors (see below), whose sum is σ = 140219436. Its totient is φ = 26708448.

The previous prime is 66771091. The next prime is 66771167. The reversal of 66771140 is 4117766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 46485124 + 20286016 = 6818^2 + 4504^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66771097 and 66771106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1669259 + ... + 1669298.

It is an arithmetic number, because the mean of its divisors is an integer number (11684953).

Almost surely, 2^66771140 is an apocalyptic number.

It is an amenable number.

66771140 is an abundant number, since it is smaller than the sum of its proper divisors (73448296).

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

66771140 is a wasteful number, since it uses less digits than its factorization.

66771140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338566 (or 3338564 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 66771140 is about 8171.3609637563. The cubic root of 66771140 is about 405.6918317978.

The spelling of 66771140 in words is "sixty-six million, seven hundred seventy-one thousand, one hundred forty".