165096872581 has 2 divisors, whose sum is σ = 165096872582. Its totient is φ = 165096872580.

The previous prime is 165096872561. The next prime is 165096872593. The reversal of 165096872581 is 185278690561.

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., 156827880225 + 8268992356 = 396015^2 + 90934^2 .

It is an emirp because it is prime and its reverse (185278690561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165096872581 - 2¹³ = 165096864389 is a prime.

It is a super-2 number, since 2×165096872581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165096872531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82548436290 + 82548436291.

It is an arithmetic number, because the mean of its divisors is an integer number (82548436291).

Almost surely, 2^165096872581 is an apocalyptic number.

It is an amenable number.

165096872581 is a deficient number, since it is larger than the sum of its proper divisors (1).

165096872581 is an equidigital number, since it uses as much as digits as its factorization.

165096872581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7257600, while the sum is 58.

The spelling of 165096872581 in words is "one hundred sixty-five billion, ninety-six million, eight hundred seventy-two thousand, five hundred eighty-one".