266699664000 has 1536 divisors, whose sum is σ = 1215320371200. Its totient is φ = 54438912000.

The previous prime is 266699663969. The next prime is 266699664001. The reversal of 266699664000 is 466996662.

It is a happy number.

It is a super-2 number, since 2×266699664000² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266699664001) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 742895821 + ... + 742896179.

It is an arithmetic number, because the mean of its divisors is an integer number (791224200).

Almost surely, 2^266699664000 is an apocalyptic number.

266699664000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266699664000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (607660185600).

266699664000 is an abundant number, since it is smaller than the sum of its proper divisors (948620707200).

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

266699664000 is a wasteful number, since it uses less digits than its factorization.

266699664000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 54.

The spelling of 266699664000 in words is "two hundred sixty-six billion, six hundred ninety-nine million, six hundred sixty-four thousand".