1861486561843 has 8 divisors (see below), whose sum is σ = 1942502983200. Its totient is φ = 1780476992448.

The previous prime is 1861486561811. The next prime is 1861486561853. The reversal of 1861486561843 is 3481656841681.

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 1861486561843 - 2⁵ = 1861486561811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861486561853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1153938 + ... + 2248231.

It is an arithmetic number, because the mean of its divisors is an integer number (242812872900).

Almost surely, 2^{1861486561843} is an apocalyptic number.

1861486561843 is a deficient number, since it is larger than the sum of its proper divisors (81016421357).

1861486561843 is a wasteful number, since it uses less digits than its factorization.

1861486561843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425981.

The product of its digits is 26542080, while the sum is 61.

The spelling of 1861486561843 in words is "one trillion, eight hundred sixty-one billion, four hundred eighty-six million, five hundred sixty-one thousand, eight hundred forty-three".