2213161555266 has 12 divisors (see below), whose sum is σ = 4795183369782. Its totient is φ = 737720518416.

The previous prime is 2213161555247. The next prime is 2213161555279. The reversal of 2213161555266 is 6625551613122.

2213161555266 is a `hidden beast` number, since 2 + 2 + 1 + 3 + 1 + 615 + 5 + 5 + 26 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1846416251241 + 366745304025 = 1358829^2 + 605595^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61476709851 + ... + 61476709886.

Almost surely, 2^{2213161555266} is an apocalyptic number.

2213161555266 is an abundant number, since it is smaller than the sum of its proper divisors (2582021814516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2213161555266 is a wasteful number, since it uses less digits than its factorization.

2213161555266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122953419745 (or 122953419742 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 2213161555266 in words is "two trillion, two hundred thirteen billion, one hundred sixty-one million, five hundred fifty-five thousand, two hundred sixty-six".