166866426803 has 2 divisors, whose sum is σ = 166866426804. Its totient is φ = 166866426802.

The previous prime is 166866426767. The next prime is 166866426827. The reversal of 166866426803 is 308624668661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166866426803 - 2¹² = 166866422707 is a prime.

It is not a weakly prime, because it can be changed into another prime (166866426833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83433213401 + 83433213402.

It is an arithmetic number, because the mean of its divisors is an integer number (83433213402).

Almost surely, 2^166866426803 is an apocalyptic number.

166866426803 is a deficient number, since it is larger than the sum of its proper divisors (1).

166866426803 is an equidigital number, since it uses as much as digits as its factorization.

166866426803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11943936, while the sum is 56.

The spelling of 166866426803 in words is "one hundred sixty-six billion, eight hundred sixty-six million, four hundred twenty-six thousand, eight hundred three".