165704138137 has 2 divisors, whose sum is σ = 165704138138. Its totient is φ = 165704138136.

The previous prime is 165704138123. The next prime is 165704138207. The reversal of 165704138137 is 731831407561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165470781961 + 233356176 = 406781^2 + 15276^2 .

It is a cyclic number.

It is not a de Polignac number, because 165704138137 - 2⁷ = 165704138009 is a prime.

It is a super-2 number, since 2×165704138137² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165704108137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82852069068 + 82852069069.

It is an arithmetic number, because the mean of its divisors is an integer number (82852069069).

Almost surely, 2^165704138137 is an apocalyptic number.

It is an amenable number.

165704138137 is a deficient number, since it is larger than the sum of its proper divisors (1).

165704138137 is an equidigital number, since it uses as much as digits as its factorization.

165704138137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 165704138137 in words is "one hundred sixty-five billion, seven hundred four million, one hundred thirty-eight thousand, one hundred thirty-seven".