165571370473 has 2 divisors, whose sum is σ = 165571370474. Its totient is φ = 165571370472.

The previous prime is 165571370347. The next prime is 165571370509. The reversal of 165571370473 is 374073175561.

Together with previous prime (165571370347) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160150435344 + 5420935129 = 400188^2 + 73627^2 .

It is a cyclic number.

It is not a de Polignac number, because 165571370473 - 2⁹ = 165571369961 is a prime.

It is not a weakly prime, because it can be changed into another prime (165571377473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82785685236 + 82785685237.

It is an arithmetic number, because the mean of its divisors is an integer number (82785685237).

Almost surely, 2^165571370473 is an apocalyptic number.

It is an amenable number.

165571370473 is a deficient number, since it is larger than the sum of its proper divisors (1).

165571370473 is an equidigital number, since it uses as much as digits as its factorization.

165571370473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1852200, while the sum is 49.

The spelling of 165571370473 in words is "one hundred sixty-five billion, five hundred seventy-one million, three hundred seventy thousand, four hundred seventy-three".