66660264 has 96 divisors (see below), whose sum is σ = 208578240. Its totient is φ = 19008000.

The previous prime is 66660263. The next prime is 66660289. The reversal of 66660264 is 46206666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66660263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10989 + ... + 15939.

It is an arithmetic number, because the mean of its divisors is an integer number (2172690).

Almost surely, 2^66660264 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 66660264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104289120).

66660264 is an abundant number, since it is smaller than the sum of its proper divisors (141917976).

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

66660264 is a wasteful number, since it uses less digits than its factorization.

66660264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4991 (or 4984 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 66660264 is about 8164.5737182048. The cubic root of 66660264 is about 405.4671518520.

It can be divided in two parts, 666602 and 64, that added together give a palindrome (666666).

The spelling of 66660264 in words is "sixty-six million, six hundred sixty thousand, two hundred sixty-four".