165825558377 has 2 divisors, whose sum is σ = 165825558378. Its totient is φ = 165825558376.

The previous prime is 165825558299. The next prime is 165825558419. The reversal of 165825558377 is 773855528561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130867403536 + 34958154841 = 361756^2 + 186971^2 .

It is an emirp because it is prime and its reverse (773855528561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165825558377 - 2⁸ = 165825558121 is a prime.

It is a super-2 number, since 2×165825558377² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165825558077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82912779188 + 82912779189.

It is an arithmetic number, because the mean of its divisors is an integer number (82912779189).

Almost surely, 2^165825558377 is an apocalyptic number.

It is an amenable number.

165825558377 is a deficient number, since it is larger than the sum of its proper divisors (1).

165825558377 is an equidigital number, since it uses as much as digits as its factorization.

165825558377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560000, while the sum is 62.

The spelling of 165825558377 in words is "one hundred sixty-five billion, eight hundred twenty-five million, five hundred fifty-eight thousand, three hundred seventy-seven".