165418144993 has 2 divisors, whose sum is σ = 165418144994. Its totient is φ = 165418144992.

The previous prime is 165418144981. The next prime is 165418145029. The reversal of 165418144993 is 399441814561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111347013969 + 54071131024 = 333687^2 + 232532^2 .

It is a cyclic number.

It is not a de Polignac number, because 165418144993 - 2⁹ = 165418144481 is a prime.

It is not a weakly prime, because it can be changed into another prime (165418144963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82709072496 + 82709072497.

It is an arithmetic number, because the mean of its divisors is an integer number (82709072497).

Almost surely, 2^165418144993 is an apocalyptic number.

It is an amenable number.

165418144993 is a deficient number, since it is larger than the sum of its proper divisors (1).

165418144993 is an equidigital number, since it uses as much as digits as its factorization.

165418144993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 55.

The spelling of 165418144993 in words is "one hundred sixty-five billion, four hundred eighteen million, one hundred forty-four thousand, nine hundred ninety-three".