266557630456 has 64 divisors (see below), whose sum is σ = 545343321600. Its totient is φ = 121412074368.

The previous prime is 266557630447. The next prime is 266557630457. The reversal of 266557630456 is 654036755662.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 266557630397 and 266557630406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266557630457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2881125 + ... + 2972203.

It is an arithmetic number, because the mean of its divisors is an integer number (8520989400).

Almost surely, 2^266557630456 is an apocalyptic number.

266557630456 is a gapful number since it is divisible by the number (26) 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 266557630456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272671660800).

266557630456 is an abundant number, since it is smaller than the sum of its proper divisors (278785691144).

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

266557630456 is a wasteful number, since it uses less digits than its factorization.

266557630456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91468 (or 91464 counting only the distinct ones).

The product of its (nonzero) digits is 27216000, while the sum is 55.

The spelling of 266557630456 in words is "two hundred sixty-six billion, five hundred fifty-seven million, six hundred thirty thousand, four hundred fifty-six".