161840370073 has 4 divisors (see below), whose sum is σ = 171360391860. Its totient is φ = 152320348288.

The previous prime is 161840370023. The next prime is 161840370089. The reversal of 161840370073 is 370073048161.

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 75805507584 + 86034862489 = 275328^2 + 293317^2 .

It is a cyclic number.

It is not a de Polignac number, because 161840370073 - 2²⁵ = 161806815641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161840370023) 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 in 3 ways as a sum of consecutive naturals, for example, 4760010868 + ... + 4760010901.

It is an arithmetic number, because the mean of its divisors is an integer number (42840097965).

Almost surely, 2^161840370073 is an apocalyptic number.

It is an amenable number.

161840370073 is a deficient number, since it is larger than the sum of its proper divisors (9520021787).

161840370073 is an equidigital number, since it uses as much as digits as its factorization.

161840370073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9520021786.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 161840370073 in words is "one hundred sixty-one billion, eight hundred forty million, three hundred seventy thousand, seventy-three".