161533795789 has 4 divisors (see below), whose sum is σ = 161538842556. Its totient is φ = 161528749024.

The previous prime is 161533795777. The next prime is 161533795807. The reversal of 161533795789 is 987597335161.

161533795789 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 65659962564 + 95873833225 = 256242^2 + 309635^2 .

It is a cyclic number.

It is not a de Polignac number, because 161533795789 - 2¹⁷ = 161533664717 is a prime.

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 161533795789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161533795739) 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 3 ways as a sum of consecutive naturals, for example, 2475064 + ... + 2539489.

It is an arithmetic number, because the mean of its divisors is an integer number (40384710639).

Almost surely, 2^161533795789 is an apocalyptic number.

It is an amenable number.

161533795789 is a deficient number, since it is larger than the sum of its proper divisors (5046767).

161533795789 is an equidigital number, since it uses as much as digits as its factorization.

161533795789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046766.

The product of its digits is 42865200, while the sum is 64.

The spelling of 161533795789 in words is "one hundred sixty-one billion, five hundred thirty-three million, seven hundred ninety-five thousand, seven hundred eighty-nine".