11155611213 has 12 divisors (see below), whose sum is σ = 16261493820. Its totient is φ = 7368843456.

The previous prime is 11155611211. The next prime is 11155611277. The reversal of 11155611213 is 31211655111.

11155611213 is a `hidden beast` number, since 11 + 15 + 5 + 611 + 21 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7589371689 + 3566239524 = 87117^2 + 59718^2 .

It is not a de Polignac number, because 11155611213 - 2¹ = 11155611211 is a prime.

It is a super-2 number, since 2×11155611213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155611211) 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, 5684856 + ... + 5686817.

It is an arithmetic number, because the mean of its divisors is an integer number (1355124485).

Almost surely, 2^11155611213 is an apocalyptic number.

It is an amenable number.

11155611213 is a deficient number, since it is larger than the sum of its proper divisors (5105882607).

11155611213 is a wasteful number, since it uses less digits than its factorization.

11155611213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11371788 (or 11371785 counting only the distinct ones).

The product of its digits is 900, while the sum is 27.

The spelling of 11155611213 in words is "eleven billion, one hundred fifty-five million, six hundred eleven thousand, two hundred thirteen".