266005643552564 has 12 divisors (see below), whose sum is σ = 469629432644484. Its totient is φ = 131825805654144.

The previous prime is 266005643552557. The next prime is 266005643552567. The reversal of 266005643552564 is 465255346500662.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 43000701330064 + 223004942222500 = 6557492^2 + 14933350^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266005643552567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294254030027 + ... + 294254030930.

It is an arithmetic number, because the mean of its divisors is an integer number (39135786053707).

Almost surely, 2^{266005643552564} is an apocalyptic number.

It is an amenable number.

266005643552564 is a deficient number, since it is larger than the sum of its proper divisors (203623789091920).

266005643552564 is a wasteful number, since it uses less digits than its factorization.

266005643552564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588508061074 (or 588508061072 counting only the distinct ones).

The product of its (nonzero) digits is 155520000, while the sum is 59.

The spelling of 266005643552564 in words is "two hundred sixty-six trillion, five billion, six hundred forty-three million, five hundred fifty-two thousand, five hundred sixty-four".