161774476009 has 2 divisors, whose sum is σ = 161774476010. Its totient is φ = 161774476008.

The previous prime is 161774475997. The next prime is 161774476027. The reversal of 161774476009 is 900674477161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149481210384 + 12293265625 = 386628^2 + 110875^2 .

It is a cyclic number.

It is not a de Polignac number, because 161774476009 - 2⁹ = 161774475497 is a prime.

It is not a weakly prime, because it can be changed into another prime (161774476709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80887238004 + 80887238005.

It is an arithmetic number, because the mean of its divisors is an integer number (80887238005).

Almost surely, 2^161774476009 is an apocalyptic number.

It is an amenable number.

161774476009 is a deficient number, since it is larger than the sum of its proper divisors (1).

161774476009 is an equidigital number, since it uses as much as digits as its factorization.

161774476009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 161774476009 in words is "one hundred sixty-one billion, seven hundred seventy-four million, four hundred seventy-six thousand, nine".