165611113 has 2 divisors, whose sum is σ = 165611114. Its totient is φ = 165611112.

The previous prime is 165611101. The next prime is 165611119. The reversal of 165611113 is 311116561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95101504 + 70509609 = 9752^2 + 8397^2 .

It is a cyclic number.

It is not a de Polignac number, because 165611113 - 2²⁵ = 132056681 is a prime.

It is equal to p_9271150 and since 165611113 and 9271150 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (165611119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82805556 + 82805557.

It is an arithmetic number, because the mean of its divisors is an integer number (82805557).

Almost surely, 2^165611113 is an apocalyptic number.

It is an amenable number.

165611113 is a deficient number, since it is larger than the sum of its proper divisors (1).

165611113 is an equidigital number, since it uses as much as digits as its factorization.

165611113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 25.

The square root of 165611113 is about 12868.9981350531. The cubic root of 165611113 is about 549.1569596872.

Adding to 165611113 its reverse (311116561), we get a palindrome (476727674).

It can be divided in two parts, 1656 and 11113, that added together give a square (12769 = 113²).

The spelling of 165611113 in words is "one hundred sixty-five million, six hundred eleven thousand, one hundred thirteen".