266404990656 has 168 divisors, whose sum is σ = 846393609216. Its totient is φ = 73660285440.

The previous prime is 266404990603. The next prime is 266404990661. The reversal of 266404990656 is 656099404662.

It is a happy number.

266404990656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (168).

It is a junction number, because it is equal to n+sod(n) for n = 266404990596 and 266404990605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165076 + ... + 748371.

Almost surely, 2^266404990656 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 266404990656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423196804608).

266404990656 is an abundant number, since it is smaller than the sum of its proper divisors (579988618560).

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

266404990656 is a wasteful number, since it uses less digits than its factorization.

266404990656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913507 (or 913490 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 57.

The spelling of 266404990656 in words is "two hundred sixty-six billion, four hundred four million, nine hundred ninety thousand, six hundred fifty-six".