166471643777 has 2 divisors, whose sum is σ = 166471643778. Its totient is φ = 166471643776.

The previous prime is 166471643747. The next prime is 166471643809. The reversal of 166471643777 is 777346174661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157197183361 + 9274460416 = 396481^2 + 96304^2 .

It is a cyclic number.

It is not a de Polignac number, because 166471643777 - 2³⁰ = 165397901953 is a prime.

It is not a weakly prime, because it can be changed into another prime (166471643747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83235821888 + 83235821889.

It is an arithmetic number, because the mean of its divisors is an integer number (83235821889).

Almost surely, 2^166471643777 is an apocalyptic number.

It is an amenable number.

166471643777 is a deficient number, since it is larger than the sum of its proper divisors (1).

166471643777 is an equidigital number, since it uses as much as digits as its factorization.

166471643777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24893568, while the sum is 59.

The spelling of 166471643777 in words is "one hundred sixty-six billion, four hundred seventy-one million, six hundred forty-three thousand, seven hundred seventy-seven".