161001568129 has 2 divisors, whose sum is σ = 161001568130. Its totient is φ = 161001568128.

The previous prime is 161001568111. The next prime is 161001568139. The reversal of 161001568129 is 921865100161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144784055025 + 16217513104 = 380505^2 + 127348^2 .

It is a cyclic number.

It is not a de Polignac number, because 161001568129 - 2⁵ = 161001568097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161001568091 and 161001568100.

It is not a weakly prime, because it can be changed into another prime (161001568139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80500784064 + 80500784065.

It is an arithmetic number, because the mean of its divisors is an integer number (80500784065).

Almost surely, 2^161001568129 is an apocalyptic number.

It is an amenable number.

161001568129 is a deficient number, since it is larger than the sum of its proper divisors (1).

161001568129 is an equidigital number, since it uses as much as digits as its factorization.

161001568129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 161001568129 in words is "one hundred sixty-one billion, one million, five hundred sixty-eight thousand, one hundred twenty-nine".