161859788045 has 8 divisors (see below), whose sum is σ = 197896495896. Its totient is φ = 127044663616.

The previous prime is 161859788039. The next prime is 161859788071. The reversal of 161859788045 is 540887958161.

It can be written as a sum of positive squares in 4 ways, for example, as 10695903241 + 151163884804 = 103421^2 + 388798^2 .

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 161859788045 - 2¹⁸ = 161859525901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305395562 + ... + 305396091.

It is an arithmetic number, because the mean of its divisors is an integer number (24737061987).

Almost surely, 2^161859788045 is an apocalyptic number.

It is an amenable number.

161859788045 is a deficient number, since it is larger than the sum of its proper divisors (36036707851).

161859788045 is an equidigital number, since it uses as much as digits as its factorization.

161859788045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610791711.

The product of its (nonzero) digits is 19353600, while the sum is 62.

The spelling of 161859788045 in words is "one hundred sixty-one billion, eight hundred fifty-nine million, seven hundred eighty-eight thousand, forty-five".