1665164113 has 2 divisors, whose sum is σ = 1665164114. Its totient is φ = 1665164112.

The previous prime is 1665164087. The next prime is 1665164117. The reversal of 1665164113 is 3114615661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1262238784 + 402925329 = 35528^2 + 20073^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665164113 - 2²¹ = 1663066961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1665164117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832582056 + 832582057.

It is an arithmetic number, because the mean of its divisors is an integer number (832582057).

Almost surely, 2^1665164113 is an apocalyptic number.

It is an amenable number.

1665164113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665164113 is an equidigital number, since it uses as much as digits as its factorization.

1665164113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 1665164113 is about 40806.4224479432. The cubic root of 1665164113 is about 1185.2746995008.

Adding to 1665164113 its reverse (3114615661), we get a palindrome (4779779774).

It can be divided in two parts, 166 and 5164113, that multiplied together give a palindrome (857242758).

The spelling of 1665164113 in words is "one billion, six hundred sixty-five million, one hundred sixty-four thousand, one hundred thirteen".