266023213556 has 12 divisors (see below), whose sum is σ = 465546688740. Its totient is φ = 133009873920.

The previous prime is 266023213543. The next prime is 266023213567. The reversal of 266023213556 is 655312320662.

It can be written as a sum of positive squares in 2 ways, for example, as 201705181456 + 64318032100 = 449116^2 + 253610^2 .

It is a super-2 number, since 2×266023213556² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50171 + ... + 731138.

It is an arithmetic number, because the mean of its divisors is an integer number (38795557395).

Almost surely, 2^266023213556 is an apocalyptic number.

It is an amenable number.

266023213556 is a deficient number, since it is larger than the sum of its proper divisors (199523475184).

266023213556 is a wasteful number, since it uses less digits than its factorization.

266023213556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866434 (or 866432 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 266023213556 in words is "two hundred sixty-six billion, twenty-three million, two hundred thirteen thousand, five hundred fifty-six".