111501100161 has 12 divisors (see below), whose sum is σ = 175698703440. Its totient is φ = 67576424280.

The previous prime is 111501100133. The next prime is 111501100169. The reversal of 111501100161 is 161001105111.

It is a happy number.

111501100161 is a `hidden beast` number, since 1 + 1 + 1 + 501 + 1 + 0 + 0 + 161 = 666.

It is not a de Polignac number, because 111501100161 - 2⁷ = 111501100033 is a prime.

It is a super-2 number, since 2×111501100161² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111501100169) 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, 563136771 + ... + 563136968.

It is an arithmetic number, because the mean of its divisors is an integer number (14641558620).

Almost surely, 2^111501100161 is an apocalyptic number.

111501100161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111501100161 is a deficient number, since it is larger than the sum of its proper divisors (64197603279).

111501100161 is a wasteful number, since it uses less digits than its factorization.

111501100161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126273756 (or 1126273753 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 18.

Adding to 111501100161 its reverse (161001105111), we get a palindrome (272502205272).

The spelling of 111501100161 in words is "one hundred eleven billion, five hundred one million, one hundred thousand, one hundred sixty-one".