66661284 has 96 divisors (see below), whose sum is σ = 173408256. Its totient is φ = 19837440.

The previous prime is 66661279. The next prime is 66661289. The reversal of 66661284 is 48216666.

It is an interprime number because it is at equal distance from previous prime (66661279) and next prime (66661289).

It is not an unprimeable number, because it can be changed into a prime (66661289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 524829 + ... + 524955.

It is an arithmetic number, because the mean of its divisors is an integer number (1806336).

Almost surely, 2^66661284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66661284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86704128).

66661284 is an abundant number, since it is smaller than the sum of its proper divisors (106746972).

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

66661284 is a wasteful number, since it uses less digits than its factorization.

66661284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 263 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 66661284 is about 8164.6361829539. The cubic root of 66661284 is about 405.4692199225.

The spelling of 66661284 in words is "sixty-six million, six hundred sixty-one thousand, two hundred eighty-four".