1861854111108 has 18 divisors (see below), whose sum is σ = 4706353447614. Its totient is φ = 620618037024.

The previous prime is 1861854111059. The next prime is 1861854111113. The reversal of 1861854111108 is 8011114581681.

1861854111108 is a `hidden beast` number, since 1 + 8 + 618 + 5 + 4 + 1 + 11 + 10 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1293696958464 + 568157152644 = 1137408^2 + 753762^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25859084841 + ... + 25859084912.

It is an arithmetic number, because the mean of its divisors is an integer number (261464080423).

Almost surely, 2^{1861854111108} is an apocalyptic number.

1861854111108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1861854111108 is an abundant number, since it is smaller than the sum of its proper divisors (2844499336506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861854111108 is a wasteful number, since it uses less digits than its factorization.

1861854111108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51718169763 (or 51718169758 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 45.

Adding to 1861854111108 its reverse (8011114581681), we get a palindrome (9872968692789).

The spelling of 1861854111108 in words is "one trillion, eight hundred sixty-one billion, eight hundred fifty-four million, one hundred eleven thousand, one hundred eight".