11123457165 has 32 divisors (see below), whose sum is σ = 19780675200. Its totient is φ = 5930818560.

The previous prime is 11123457143. The next prime is 11123457211. The reversal of 11123457165 is 56175432111.

11123457165 is a `hidden beast` number, since 1 + 1 + 1 + 23 + 4 + 571 + 65 = 666.

It is not a de Polignac number, because 11123457165 - 2⁸ = 11123456909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 569410 + ... + 588620.

It is an arithmetic number, because the mean of its divisors is an integer number (618146100).

Almost surely, 2^11123457165 is an apocalyptic number.

11123457165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11123457165 is a deficient number, since it is larger than the sum of its proper divisors (8657218035).

11123457165 is a wasteful number, since it uses less digits than its factorization.

11123457165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23514 (or 23508 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

Adding to 11123457165 its reverse (56175432111), we get a palindrome (67298889276).

The spelling of 11123457165 in words is "eleven billion, one hundred twenty-three million, four hundred fifty-seven thousand, one hundred sixty-five".