165673537 has 2 divisors, whose sum is σ = 165673538. Its totient is φ = 165673536.

The previous prime is 165673477. The next prime is 165673567. The reversal of 165673537 is 735376561.

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., 126247696 + 39425841 = 11236^2 + 6279^2 .

It is an emirp because it is prime and its reverse (735376561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165673537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165673493 and 165673502.

It is not a weakly prime, because it can be changed into another prime (165673567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82836768 + 82836769.

It is an arithmetic number, because the mean of its divisors is an integer number (82836769).

Almost surely, 2^165673537 is an apocalyptic number.

It is an amenable number.

165673537 is a deficient number, since it is larger than the sum of its proper divisors (1).

165673537 is an equidigital number, since it uses as much as digits as its factorization.

165673537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396900, while the sum is 43.

The square root of 165673537 is about 12871.4232701749. The cubic root of 165673537 is about 549.2259491554.

The spelling of 165673537 in words is "one hundred sixty-five million, six hundred seventy-three thousand, five hundred thirty-seven".