66018636 has 18 divisors (see below), whose sum is σ = 166880532. Its totient is φ = 22006200.

The previous prime is 66018613. The next prime is 66018643. The reversal of 66018636 is 63681066.

66018636 is a `hidden beast` number, since 6 + 6 + 0 + 18 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1833851 = 66018636 / (6 + 6 + 0 + 1 + 8 + 6 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 66018636.

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 5 ways as a sum of consecutive naturals, for example, 916890 + ... + 916961.

Almost surely, 2^66018636 is an apocalyptic number.

It is an amenable number.

66018636 is an abundant number, since it is smaller than the sum of its proper divisors (100861896).

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

66018636 is a wasteful number, since it uses less digits than its factorization.

66018636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833861 (or 1833856 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 66018636 is about 8125.1852901949. The cubic root of 66018636 is about 404.1620351236.

The spelling of 66018636 in words is "sixty-six million, eighteen thousand, six hundred thirty-six".