266405265111420 has 144 divisors (see below), whose sum is σ = 843363099371520. Its totient is φ = 67941967978368.

The previous prime is 266405265111389. The next prime is 266405265111439. The reversal of 266405265111420 is 24111562504662.

266405265111420 is a `hidden beast` number, since 2 + 6 + 6 + 4 + 0 + 52 + 65 + 111 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21306051 + ... + 31412709.

It is an arithmetic number, because the mean of its divisors is an integer number (5856688190080).

Almost surely, 2^{266405265111420} is an apocalyptic number.

266405265111420 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 266405265111420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (421681549685760).

266405265111420 is an abundant number, since it is smaller than the sum of its proper divisors (576957834260100).

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

266405265111420 is a wasteful number, since it uses less digits than its factorization.

266405265111420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10113064 (or 10113059 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 266405265111420 in words is "two hundred sixty-six trillion, four hundred five billion, two hundred sixty-five million, one hundred eleven thousand, four hundred twenty".