1156665511 has 2 divisors, whose sum is σ = 1156665512. Its totient is φ = 1156665510.

The previous prime is 1156665491. The next prime is 1156665529. The reversal of 1156665511 is 1155666511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1156665511 - 2¹⁷ = 1156534439 is a prime.

It is a super-2 number, since 2×1156665511² = 2675750208673782242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1156665571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578332755 + 578332756.

It is an arithmetic number, because the mean of its divisors is an integer number (578332756).

Almost surely, 2^1156665511 is an apocalyptic number.

1156665511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156665511 is an equidigital number, since it uses as much as digits as its factorization.

1156665511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 37.

The square root of 1156665511 is about 34009.7855182887. The cubic root of 1156665511 is about 1049.7098248796.

It can be divided in two parts, 11566 and 65511, that added together give a palindrome (77077).

The spelling of 1156665511 in words is "one billion, one hundred fifty-six million, six hundred sixty-five thousand, five hundred eleven".