666255376512 has 1024 divisors, whose sum is σ = 2474634240000. Its totient is φ = 173717913600.

The previous prime is 666255376481. The next prime is 666255376517. The reversal of 666255376512 is 215673552666.

It is a super-2 number, since 2×666255376512² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (666255376517) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 356094937 + ... + 356096807.

It is an arithmetic number, because the mean of its divisors is an integer number (2416635000).

Almost surely, 2^666255376512 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 666255376512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237317120000).

666255376512 is an abundant number, since it is smaller than the sum of its proper divisors (1808378863488).

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

666255376512 is a wasteful number, since it uses less digits than its factorization.

666255376512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1970 (or 1952 counting only the distinct ones).

The product of its digits is 13608000, while the sum is 54.

The spelling of 666255376512 in words is "six hundred sixty-six billion, two hundred fifty-five million, three hundred seventy-six thousand, five hundred twelve".