1861135943558 has 16 divisors (see below), whose sum is σ = 2888677944000. Its totient is φ = 898259037312.

The previous prime is 1861135943503. The next prime is 1861135943599. The reversal of 1861135943558 is 8553495311681.

It is a junction number, because it is equal to n+sod(n) for n = 1861135943497 and 1861135943506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3696803 + ... + 4169966.

It is an arithmetic number, because the mean of its divisors is an integer number (180542371500).

Almost surely, 2^{1861135943558} is an apocalyptic number.

1861135943558 is a deficient number, since it is larger than the sum of its proper divisors (1027542000442).

1861135943558 is a wasteful number, since it uses less digits than its factorization.

1861135943558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7870879.

The product of its digits is 15552000, while the sum is 59.

The spelling of 1861135943558 in words is "one trillion, eight hundred sixty-one billion, one hundred thirty-five million, nine hundred forty-three thousand, five hundred fifty-eight".