161051622161 has 6 divisors (see below), whose sum is σ = 171082519350. Its totient is φ = 151577997056.

The previous prime is 161051622139. The next prime is 161051622181. The reversal of 161051622161 is 161226150161.

It can be written as a sum of positive squares in 3 ways, for example, as 36650805136 + 124400817025 = 191444^2 + 352705^2 .

It is not a de Polignac number, because 161051622161 - 2¹⁴ = 161051605777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161051622131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 278635736 + ... + 278636313.

It is an arithmetic number, because the mean of its divisors is an integer number (28513753225).

Almost surely, 2^161051622161 is an apocalyptic number.

It is an amenable number.

161051622161 is a deficient number, since it is larger than the sum of its proper divisors (10030897189).

161051622161 is an equidigital number, since it uses as much as digits as its factorization.

161051622161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557272083 (or 557272066 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 161051622161 in words is "one hundred sixty-one billion, fifty-one million, six hundred twenty-two thousand, one hundred sixty-one".