166500179939 has 2 divisors, whose sum is σ = 166500179940. Its totient is φ = 166500179938.

The previous prime is 166500179929. The next prime is 166500179999. The reversal of 166500179939 is 939971005661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166500179939 is a prime.

It is not a weakly prime, because it can be changed into another prime (166500179929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83250089969 + 83250089970.

It is an arithmetic number, because the mean of its divisors is an integer number (83250089970).

Almost surely, 2^166500179939 is an apocalyptic number.

166500179939 is a deficient number, since it is larger than the sum of its proper divisors (1).

166500179939 is an equidigital number, since it uses as much as digits as its factorization.

166500179939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2755620, while the sum is 56.

The spelling of 166500179939 in words is "one hundred sixty-six billion, five hundred million, one hundred seventy-nine thousand, nine hundred thirty-nine".