266538387456 has 576 divisors, whose sum is σ = 878965214400. Its totient is φ = 80024371200.

The previous prime is 266538387431. The next prime is 266538387461. The reversal of 266538387456 is 654783835662.

266538387456 is a `hidden beast` number, since 2 + 66 + 538 + 38 + 7 + 4 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a junction number, because it is equal to n+sod(n) for n = 266538387393 and 266538387402.

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, 990848890 + ... + 990849158.

It is an arithmetic number, because the mean of its divisors is an integer number (1525981275).

Almost surely, 2^266538387456 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 266538387456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (439482607200).

266538387456 is an abundant number, since it is smaller than the sum of its proper divisors (612426826944).

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

266538387456 is a wasteful number, since it uses less digits than its factorization.

266538387456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 466 counting only the distinct ones).

The product of its digits is 174182400, while the sum is 63.

The spelling of 266538387456 in words is "two hundred sixty-six billion, five hundred thirty-eight million, three hundred eighty-seven thousand, four hundred fifty-six".