666524012120 has 64 divisors (see below), whose sum is σ = 1534309931520. Its totient is φ = 260473170304.

The previous prime is 666524012113. The next prime is 666524012131. The reversal of 666524012120 is 21210425666.

It is a super-3 number, since 3×666524012120³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 743579 + ... + 1373301.

It is an arithmetic number, because the mean of its divisors is an integer number (23973592680).

Almost surely, 2^666524012120 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 666524012120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (767154965760).

666524012120 is an abundant number, since it is smaller than the sum of its proper divisors (867785919400).

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

666524012120 is a wasteful number, since it uses less digits than its factorization.

666524012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630344 (or 630340 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 666524012120 its reverse (21210425666), we get a palindrome (687734437786).

The spelling of 666524012120 in words is "six hundred sixty-six billion, five hundred twenty-four million, twelve thousand, one hundred twenty".