166193671477 has 2 divisors, whose sum is σ = 166193671478. Its totient is φ = 166193671476.

The previous prime is 166193671471. The next prime is 166193671537. The reversal of 166193671477 is 774176391661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126049141156 + 40144530321 = 355034^2 + 200361^2 .

It is a cyclic number.

It is not a de Polignac number, because 166193671477 - 2³¹ = 164046187829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166193671471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83096835738 + 83096835739.

It is an arithmetic number, because the mean of its divisors is an integer number (83096835739).

Almost surely, 2^166193671477 is an apocalyptic number.

It is an amenable number.

166193671477 is a deficient number, since it is larger than the sum of its proper divisors (1).

166193671477 is an equidigital number, since it uses as much as digits as its factorization.

166193671477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8001504, while the sum is 58.

The spelling of 166193671477 in words is "one hundred sixty-six billion, one hundred ninety-three million, six hundred seventy-one thousand, four hundred seventy-seven".