266660520511 has 12 divisors (see below), whose sum is σ = 338396653800. Its totient is φ = 207787418160.

The previous prime is 266660520457. The next prime is 266660520569. The reversal of 266660520511 is 115025066662.

It is not a de Polignac number, because 266660520511 - 2⁹ = 266660519999 is a prime.

It is a super-2 number, since 2×266660520511² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266660520211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247365436 + ... + 247366513.

It is an arithmetic number, because the mean of its divisors is an integer number (28199721150).

Almost surely, 2^266660520511 is an apocalyptic number.

266660520511 is a deficient number, since it is larger than the sum of its proper divisors (71736133289).

266660520511 is a wasteful number, since it uses less digits than its factorization.

266660520511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494731974 (or 494731967 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 266660520511 in words is "two hundred sixty-six billion, six hundred sixty million, five hundred twenty thousand, five hundred eleven".