161555723041 has 8 divisors (see below), whose sum is σ = 165927695400. Its totient is φ = 157184045568.

The previous prime is 161555723011. The next prime is 161555723057. The reversal of 161555723041 is 140327555161.

It is a happy number.

161555723041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28552550625 + 133003172416 = 168975^2 + 364696^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161555723041 - 2⁵ = 161555723009 is a prime.

It is a super-2 number, since 2×161555723041² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161555722985 and 161555723003.

It is not an unprimeable number, because it can be changed into a prime (161555723011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1465935 + ... + 1572283.

It is an arithmetic number, because the mean of its divisors is an integer number (20740961925).

Almost surely, 2^161555723041 is an apocalyptic number.

It is an amenable number.

161555723041 is a deficient number, since it is larger than the sum of its proper divisors (4371972359).

161555723041 is a wasteful number, since it uses less digits than its factorization.

161555723041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147443.

The product of its (nonzero) digits is 126000, while the sum is 40.

The spelling of 161555723041 in words is "one hundred sixty-one billion, five hundred fifty-five million, seven hundred twenty-three thousand, forty-one".