266660565246656 has 112 divisors (see below), whose sum is σ = 609349411679232. Its totient is φ = 113415037056000.

The previous prime is 266660565246643. The next prime is 266660565246703. The reversal of 266660565246656 is 656642565066662.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×266660565246656² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266660565246656.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 67138205 + ... + 70999011.

It is an arithmetic number, because the mean of its divisors is an integer number (5440619747136).

Almost surely, 2^{266660565246656} 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 266660565246656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304674705839616).

266660565246656 is an abundant number, since it is smaller than the sum of its proper divisors (342688846432576).

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

266660565246656 is a wasteful number, since it uses less digits than its factorization.

266660565246656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3861998 (or 3861988 counting only the distinct ones).

The product of its (nonzero) digits is 3359232000, while the sum is 71.

The spelling of 266660565246656 in words is "two hundred sixty-six trillion, six hundred sixty billion, five hundred sixty-five million, two hundred forty-six thousand, six hundred fifty-six".