266393786512 has 480 divisors, whose sum is σ = 694215567360. Its totient is φ = 98440151040.

The previous prime is 266393786497. The next prime is 266393786539. The reversal of 266393786512 is 215687393662.

It is a super-2 number, since 2×266393786512² (a number of 24 digits) contains 22 as substring.

Its product of digits (19595520) is a multiple of the sum of its prime factors (224).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2746327648 + ... + 2746327744.

It is an arithmetic number, because the mean of its divisors is an integer number (1446282432).

Almost surely, 2^266393786512 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 266393786512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347107783680).

266393786512 is an abundant number, since it is smaller than the sum of its proper divisors (427821780848).

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

266393786512 is a wasteful number, since it uses less digits than its factorization.

266393786512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 177 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 58.

The spelling of 266393786512 in words is "two hundred sixty-six billion, three hundred ninety-three million, seven hundred eighty-six thousand, five hundred twelve".