266736312440 has 128 divisors (see below), whose sum is σ = 684873221760. Its totient is φ = 92621881344.

The previous prime is 266736312257. The next prime is 266736312461. The reversal of 266736312440 is 44213637662.

It is a super-2 number, since 2×266736312440² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 266736312391 and 266736312400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12073244 + ... + 12095316.

It is an arithmetic number, because the mean of its divisors is an integer number (5350572045).

Almost surely, 2^266736312440 is an apocalyptic number.

266736312440 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 266736312440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342436610880).

266736312440 is an abundant number, since it is smaller than the sum of its proper divisors (418136909320).

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

266736312440 is a wasteful number, since it uses less digits than its factorization.

266736312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23481 (or 23477 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 44.

The spelling of 266736312440 in words is "two hundred sixty-six billion, seven hundred thirty-six million, three hundred twelve thousand, four hundred forty".