1861113506112 has 840 divisors, whose sum is σ = 6680416985088. Its totient is φ = 510267340800.

The previous prime is 1861113506089. The next prime is 1861113506123. The reversal of 1861113506112 is 2116053111681.

1861113506112 is a `hidden beast` number, since 1 + 8 + 6 + 1 + 1 + 1 + 35 + 0 + 611 + 2 = 666.

It is a super-2 number, since 2×1861113506112² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1000060062 + ... + 1000061922.

Almost surely, 2^{1861113506112} is an apocalyptic number.

1861113506112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861113506112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3340208492544).

1861113506112 is an abundant number, since it is smaller than the sum of its proper divisors (4819303478976).

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

1861113506112 is a wasteful number, since it uses less digits than its factorization.

1861113506112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057 (or 2031 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

Adding to 1861113506112 its reverse (2116053111681), we get a palindrome (3977166617793).

The spelling of 1861113506112 in words is "one trillion, eight hundred sixty-one billion, one hundred thirteen million, five hundred six thousand, one hundred twelve".