266420998586 has 4 divisors (see below), whose sum is σ = 399631497882. Its totient is φ = 133210499292.

The previous prime is 266420998583. The next prime is 266420998603. The reversal of 266420998586 is 685899024662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 685899024662 = 2 ⋅342949512331.

It can be written as a sum of positive squares in only one way, i.e., 265205430361 + 1215568225 = 514981^2 + 34865^2 .

It is a super-2 number, since 2×266420998586² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266420998583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66605249645 + ... + 66605249648.

Almost surely, 2^266420998586 is an apocalyptic number.

266420998586 is a deficient number, since it is larger than the sum of its proper divisors (133210499296).

266420998586 is a wasteful number, since it uses less digits than its factorization.

266420998586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133210499295.

The product of its (nonzero) digits is 89579520, while the sum is 65.

The spelling of 266420998586 in words is "two hundred sixty-six billion, four hundred twenty million, nine hundred ninety-eight thousand, five hundred eighty-six".