166000631000891 has 2 divisors, whose sum is σ = 166000631000892. Its totient is φ = 166000631000890.

The previous prime is 166000631000873. The next prime is 166000631000929. The reversal of 166000631000891 is 198000136000661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166000631000891 - 2²² = 166000626806587 is a prime.

It is not a weakly prime, because it can be changed into another prime (166000631000801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83000315500445 + 83000315500446.

It is an arithmetic number, because the mean of its divisors is an integer number (83000315500446).

Almost surely, 2^{166000631000891} is an apocalyptic number.

166000631000891 is a deficient number, since it is larger than the sum of its proper divisors (1).

166000631000891 is an equidigital number, since it uses as much as digits as its factorization.

166000631000891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 166000631000891 in words is "one hundred sixty-six trillion, six hundred thirty-one million, eight hundred ninety-one", and thus it is an aban number.