166842257017843 has 16 divisors (see below), whose sum is σ = 182476595541600. Its totient is φ = 151286085722880.

The previous prime is 166842257017783. The next prime is 166842257017873. The reversal of 166842257017843 is 348710752248661.

It is a cyclic number.

It is not a de Polignac number, because 166842257017843 - 2¹⁷ = 166842256886771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166842257017873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417655 + ... + 18271807.

It is an arithmetic number, because the mean of its divisors is an integer number (11404787221350).

Almost surely, 2^{166842257017843} is an apocalyptic number.

166842257017843 is a deficient number, since it is larger than the sum of its proper divisors (15634338523757).

166842257017843 is a wasteful number, since it uses less digits than its factorization.

166842257017843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17856342.

The product of its (nonzero) digits is 108380160, while the sum is 64.

The spelling of 166842257017843 in words is "one hundred sixty-six trillion, eight hundred forty-two billion, two hundred fifty-seven million, seventeen thousand, eight hundred forty-three".