166565250583 has 2 divisors, whose sum is σ = 166565250584. Its totient is φ = 166565250582.

The previous prime is 166565250571. The next prime is 166565250673. The reversal of 166565250583 is 385052565661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166565250583 - 2¹³ = 166565242391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166565250583.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166565250503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83282625291 + 83282625292.

It is an arithmetic number, because the mean of its divisors is an integer number (83282625292).

Almost surely, 2^166565250583 is an apocalyptic number.

166565250583 is a deficient number, since it is larger than the sum of its proper divisors (1).

166565250583 is an equidigital number, since it uses as much as digits as its factorization.

166565250583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480000, while the sum is 52.

The spelling of 166565250583 in words is "one hundred sixty-six billion, five hundred sixty-five million, two hundred fifty thousand, five hundred eighty-three".