666871628136 has 512 divisors, whose sum is σ = 2129587200000. Its totient is φ = 173259233280.

The previous prime is 666871628131. The next prime is 666871628147. The reversal of 666871628136 is 631826178666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 666871628136.

It is not an unprimeable number, because it can be changed into a prime (666871628131) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1056848541 + ... + 1056849171.

It is an arithmetic number, because the mean of its divisors is an integer number (4159350000).

Almost surely, 2^666871628136 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 666871628136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1064793600000).

666871628136 is an abundant number, since it is smaller than the sum of its proper divisors (1462715571864).

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

666871628136 is a wasteful number, since it uses less digits than its factorization.

666871628136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 924 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 60.

The spelling of 666871628136 in words is "six hundred sixty-six billion, eight hundred seventy-one million, six hundred twenty-eight thousand, one hundred thirty-six".