266472944640 has 1848 divisors, whose sum is σ = 1175317834752. Its totient is φ = 57689210880.

The previous prime is 266472944629. The next prime is 266472944651. The reversal of 266472944640 is 46449274662.

It is a happy number.

266472944640 is a `hidden beast` number, since 2 + 6 + 6 + 472 + 94 + 46 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (266472944629) and next prime (266472944651).

It is a super-2 number, since 2×266472944640² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 5669637097 + ... + 5669637143.

Almost surely, 2^266472944640 is an apocalyptic number.

266472944640 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 266472944640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (587658917376).

266472944640 is an abundant number, since it is smaller than the sum of its proper divisors (908844890112).

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

266472944640 is an equidigital number, since it uses as much as digits as its factorization.

266472944640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 54.

The spelling of 266472944640 in words is "two hundred sixty-six billion, four hundred seventy-two million, nine hundred forty-four thousand, six hundred forty".