213518870266 has 24 divisors (see below), whose sum is σ = 360563443380. Its totient is φ = 94262505216.

The previous prime is 213518870261. The next prime is 213518870273. The reversal of 213518870266 is 662078815312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 205779269641 + 7739600625 = 453629^2 + 87975^2 .

It is not an unprimeable number, because it can be changed into a prime (213518870261) 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, 7748311 + ... + 7775818.

Almost surely, 2^213518870266 is an apocalyptic number.

213518870266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

213518870266 is a deficient number, since it is larger than the sum of its proper divisors (147044573114).

213518870266 is a wasteful number, since it uses less digits than its factorization.

213518870266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15524190 (or 15524167 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 213518870266 in words is "two hundred thirteen billion, five hundred eighteen million, eight hundred seventy thousand, two hundred sixty-six".