1155237556111 has 4 divisors (see below), whose sum is σ = 1182103545832. Its totient is φ = 1128371566392.

The previous prime is 1155237556093. The next prime is 1155237556117. The reversal of 1155237556111 is 1116557325511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1155237556111 - 2⁵ = 1155237556079 is a prime.

It is a super-2 number, since 2×1155237556111² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 26865989677 = 1155237556111 / (1 + 1 + 5 + 5 + 2 + 3 + 7 + 5 + 5 + 6 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155237556117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13432994796 + ... + 13432994881.

It is an arithmetic number, because the mean of its divisors is an integer number (295525886458).

Almost surely, 2^{1155237556111} is an apocalyptic number.

1155237556111 is a deficient number, since it is larger than the sum of its proper divisors (26865989721).

1155237556111 is an equidigital number, since it uses as much as digits as its factorization.

1155237556111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26865989720.

The product of its digits is 157500, while the sum is 43.

The spelling of 1155237556111 in words is "one trillion, one hundred fifty-five billion, two hundred thirty-seven million, five hundred fifty-six thousand, one hundred eleven".