161505611026 has 4 divisors (see below), whose sum is σ = 242258416542. Its totient is φ = 80752805512.

The previous prime is 161505611021. The next prime is 161505611027. The reversal of 161505611026 is 620116505161.

161505611026 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 620116505161 = 31 ⋅20003758231.

It can be written as a sum of positive squares in only one way, i.e., 86292000025 + 75213611001 = 293755^2 + 274251^2 .

It is a super-2 number, since 2×161505611026² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161505610982 and 161505611000.

It is not an unprimeable number, because it can be changed into a prime (161505611021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40376402755 + ... + 40376402758.

Almost surely, 2^161505611026 is an apocalyptic number.

161505611026 is a deficient number, since it is larger than the sum of its proper divisors (80752805516).

161505611026 is an equidigital number, since it uses as much as digits as its factorization.

161505611026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80752805515.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 161505611026 in words is "one hundred sixty-one billion, five hundred five million, six hundred eleven thousand, twenty-six".