1850561342161 has 4 divisors (see below), whose sum is σ = 2114927248192. Its totient is φ = 1586195436132.

The previous prime is 1850561342107. The next prime is 1850561342171. The reversal of 1850561342161 is 1612431650581.

It is a happy number.

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 1850561342161 - 2¹¹ = 1850561340113 is a prime.

It is a super-2 number, since 2×1850561342161² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1850561342171) 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, 132182953005 + ... + 132182953018.

It is an arithmetic number, because the mean of its divisors is an integer number (528731812048).

Almost surely, 2^{1850561342161} is an apocalyptic number.

It is an amenable number.

1850561342161 is a deficient number, since it is larger than the sum of its proper divisors (264365906031).

1850561342161 is an equidigital number, since it uses as much as digits as its factorization.

1850561342161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264365906030.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 1850561342161 in words is "one trillion, eight hundred fifty billion, five hundred sixty-one million, three hundred forty-two thousand, one hundred sixty-one".