266623565442366 has 128 divisors (see below), whose sum is σ = 606251308147200. Its totient is φ = 78123545068800.

The previous prime is 266623565442343. The next prime is 266623565442413. The reversal of 266623565442366 is 663244565326662.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 266623565442297 and 266623565442306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24103330 + ... + 33379898.

It is an arithmetic number, because the mean of its divisors is an integer number (4736338344900).

Almost surely, 2^{266623565442366} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266623565442366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303125654073600).

266623565442366 is an abundant number, since it is smaller than the sum of its proper divisors (339627742704834).

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

266623565442366 is a wasteful number, since it uses less digits than its factorization.

266623565442366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9276727 (or 9276705 counting only the distinct ones).

The product of its digits is 1343692800, while the sum is 66.

The spelling of 266623565442366 in words is "two hundred sixty-six trillion, six hundred twenty-three billion, five hundred sixty-five million, four hundred forty-two thousand, three hundred sixty-six".