66661060 has 12 divisors (see below), whose sum is σ = 139988268. Its totient is φ = 26664416.

The previous prime is 66661043. The next prime is 66661079. The reversal of 66661060 is 6016666.

It can be written as a sum of positive squares in 2 ways, for example, as 43850884 + 22810176 = 6622^2 + 4776^2 .

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, 1666507 + ... + 1666546.

It is an arithmetic number, because the mean of its divisors is an integer number (11665689).

Almost surely, 2^66661060 is an apocalyptic number.

It is an amenable number.

66661060 is an abundant number, since it is smaller than the sum of its proper divisors (73327208).

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

66661060 is a wasteful number, since it uses less digits than its factorization.

66661060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333062 (or 3333060 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66661060 is about 8164.6224652460. The cubic root of 66661060 is about 405.4687657598.

The spelling of 66661060 in words is "sixty-six million, six hundred sixty-one thousand, sixty".