266668572672 has 192 divisors, whose sum is σ = 772034805360. Its totient is φ = 88696946688.

The previous prime is 266668572637. The next prime is 266668572673. The reversal of 266668572672 is 276275866662.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×266668572672² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266668572673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219119008 + ... + 219120224.

Almost surely, 2^266668572672 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 266668572672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386017402680).

266668572672 is an abundant number, since it is smaller than the sum of its proper divisors (505366232688).

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

266668572672 is an equidigital number, since it uses as much as digits as its factorization.

266668572672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996 (or 1965 counting only the distinct ones).

The product of its digits is 121927680, while the sum is 63.

The spelling of 266668572672 in words is "two hundred sixty-six billion, six hundred sixty-eight million, five hundred seventy-two thousand, six hundred seventy-two".