161137322057 has 4 divisors (see below), whose sum is σ = 161138184900. Its totient is φ = 161136459216.

The previous prime is 161137321979. The next prime is 161137322081. The reversal of 161137322057 is 750223731161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 750223731161 = 839 ⋅894187999.

It can be written as a sum of positive squares in 2 ways, for example, as 34916285881 + 126221036176 = 186859^2 + 355276^2 .

It is a cyclic number.

It is not a de Polignac number, because 161137322057 - 2²⁴ = 161120544841 is a prime.

It is a super-2 number, since 2×161137322057² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161137322057.

It is not an unprimeable number, because it can be changed into a prime (161137312057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21398 + ... + 568095.

It is an arithmetic number, because the mean of its divisors is an integer number (40284546225).

Almost surely, 2^161137322057 is an apocalyptic number.

It is an amenable number.

161137322057 is a deficient number, since it is larger than the sum of its proper divisors (862843).

161137322057 is an equidigital number, since it uses as much as digits as its factorization.

161137322057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862842.

The product of its (nonzero) digits is 52920, while the sum is 38.

The spelling of 161137322057 in words is "one hundred sixty-one billion, one hundred thirty-seven million, three hundred twenty-two thousand, fifty-seven".