166158209671 has 2 divisors, whose sum is σ = 166158209672. Its totient is φ = 166158209670.

The previous prime is 166158209663. The next prime is 166158209677. The reversal of 166158209671 is 176902851661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166158209671 - 2³ = 166158209663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166158209677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83079104835 + 83079104836.

It is an arithmetic number, because the mean of its divisors is an integer number (83079104836).

Almost surely, 2^166158209671 is an apocalyptic number.

166158209671 is a deficient number, since it is larger than the sum of its proper divisors (1).

166158209671 is an equidigital number, since it uses as much as digits as its factorization.

166158209671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 166158209671 in words is "one hundred sixty-six billion, one hundred fifty-eight million, two hundred nine thousand, six hundred seventy-one".