666636264 has 128 divisors (see below), whose sum is σ = 2124000000. Its totient is φ = 189775872.

The previous prime is 666636241. The next prime is 666636277. The reversal of 666636264 is 462636666.

It is a nude number because it is divisible by every one of its digits.

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 31 ways as a sum of consecutive naturals, for example, 533112 + ... + 534360.

It is an arithmetic number, because the mean of its divisors is an integer number (16593750).

Almost surely, 2^666636264 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 666636264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1062000000).

666636264 is an abundant number, since it is smaller than the sum of its proper divisors (1457363736).

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

666636264 is a wasteful number, since it uses less digits than its factorization.

666636264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624 (or 1614 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 45.

The square root of 666636264 is about 25819.3002228953. The cubic root of 666636264 is about 873.5671849466.

It can be divided in two parts, 66663 and 6264, that added together give a palindrome (72927).

The spelling of 666636264 in words is "six hundred sixty-six million, six hundred thirty-six thousand, two hundred sixty-four".