165556550152573 has 2 divisors, whose sum is σ = 165556550152574. Its totient is φ = 165556550152572.

The previous prime is 165556550152471. The next prime is 165556550152589. The reversal of 165556550152573 is 375251055655561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132636060333529 + 32920489819044 = 11516773^2 + 5737638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165556550152573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165556550152073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82778275076286 + 82778275076287.

It is an arithmetic number, because the mean of its divisors is an integer number (82778275076287).

Almost surely, 2^{165556550152573} is an apocalyptic number.

It is an amenable number.

165556550152573 is a deficient number, since it is larger than the sum of its proper divisors (1).

165556550152573 is an equidigital number, since it uses as much as digits as its factorization.

165556550152573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118125000, while the sum is 61.

The spelling of 165556550152573 in words is "one hundred sixty-five trillion, five hundred fifty-six billion, five hundred fifty million, one hundred fifty-two thousand, five hundred seventy-three".