266621563106631 has 16 divisors (see below), whose sum is σ = 395103334174720. Its totient is φ = 177698917096920.

The previous prime is 266621563106581. The next prime is 266621563106641. The reversal of 266621563106631 is 136601365126662.

It is not a de Polignac number, because 266621563106631 - 2¹¹ = 266621563104583 is a prime.

It is a super-2 number, since 2×266621563106631² (a number of 30 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 (266621563106641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1355223175 + ... + 1355419896.

It is an arithmetic number, because the mean of its divisors is an integer number (24693958385920).

Almost surely, 2^{266621563106631} is an apocalyptic number.

266621563106631 is a deficient number, since it is larger than the sum of its proper divisors (128481771068089).

266621563106631 is a wasteful number, since it uses less digits than its factorization.

266621563106631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710646723 (or 2710646717 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 266621563106631 in words is "two hundred sixty-six trillion, six hundred twenty-one billion, five hundred sixty-three million, one hundred six thousand, six hundred thirty-one".