166374705271 has 2 divisors, whose sum is σ = 166374705272. Its totient is φ = 166374705270.

The previous prime is 166374705269. The next prime is 166374705331. The reversal of 166374705271 is 172507473661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166374705271 - 2¹ = 166374705269 is a prime.

Together with 166374705269, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166374705221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83187352635 + 83187352636.

It is an arithmetic number, because the mean of its divisors is an integer number (83187352636).

Almost surely, 2^166374705271 is an apocalyptic number.

166374705271 is a deficient number, since it is larger than the sum of its proper divisors (1).

166374705271 is an equidigital number, since it uses as much as digits as its factorization.

166374705271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1481760, while the sum is 49.

The spelling of 166374705271 in words is "one hundred sixty-six billion, three hundred seventy-four million, seven hundred five thousand, two hundred seventy-one".