166785337711 has 4 divisors (see below), whose sum is σ = 175563513400. Its totient is φ = 158007162024.

The previous prime is 166785337703. The next prime is 166785337769. The reversal of 166785337711 is 117733587661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 117733587661 = 137 ⋅859369253.

It is a cyclic number.

It is not a de Polignac number, because 166785337711 - 2³ = 166785337703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166785337211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4389087816 + ... + 4389087853.

It is an arithmetic number, because the mean of its divisors is an integer number (43890878350).

Almost surely, 2^166785337711 is an apocalyptic number.

166785337711 is a deficient number, since it is larger than the sum of its proper divisors (8778175689).

166785337711 is an equidigital number, since it uses as much as digits as its factorization.

166785337711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8778175688.

The product of its digits is 4445280, while the sum is 55.

The spelling of 166785337711 in words is "one hundred sixty-six billion, seven hundred eighty-five million, three hundred thirty-seven thousand, seven hundred eleven".