266336430326640 has 640 divisors, whose sum is σ = 953062220113920. Its totient is φ = 68306756861952.

The previous prime is 266336430326557. The next prime is 266336430326753. The reversal of 266336430326640 is 46623034633662.

266336430326640 is a `hidden beast` number, since 2 + 6 + 6 + 3 + 36 + 4 + 303 + 266 + 40 = 666.

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 127 ways as a sum of consecutive naturals, for example, 6411081709 + ... + 6411123251.

It is an arithmetic number, because the mean of its divisors is an integer number (1489159718928).

Almost surely, 2^{266336430326640} is an apocalyptic number.

266336430326640 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 266336430326640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476531110056960).

266336430326640 is an abundant number, since it is smaller than the sum of its proper divisors (686725789787280).

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

266336430326640 is a wasteful number, since it uses less digits than its factorization.

266336430326640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42526 (or 42514 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 54.

The spelling of 266336430326640 in words is "two hundred sixty-six trillion, three hundred thirty-six billion, four hundred thirty million, three hundred twenty-six thousand, six hundred forty".