161840515633 has 4 divisors (see below), whose sum is σ = 164583575280. Its totient is φ = 159097455988.

The previous prime is 161840515631. The next prime is 161840515687. The reversal of 161840515633 is 336515048161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161840515633 - 2¹ = 161840515631 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 161840515633.

It is not an unprimeable number, because it can be changed into a prime (161840515631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1371529735 + ... + 1371529852.

It is an arithmetic number, because the mean of its divisors is an integer number (41145893820).

Almost surely, 2^161840515633 is an apocalyptic number.

It is an amenable number.

161840515633 is a deficient number, since it is larger than the sum of its proper divisors (2743059647).

161840515633 is an equidigital number, since it uses as much as digits as its factorization.

161840515633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743059646.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 161840515633 in words is "one hundred sixty-one billion, eight hundred forty million, five hundred fifteen thousand, six hundred thirty-three".