1861913579860 has 12 divisors (see below), whose sum is σ = 3910018517748. Its totient is φ = 744765431936.

The previous prime is 1861913579857. The next prime is 1861913579861. The reversal of 1861913579860 is 689753191681.

It can be written as a sum of positive squares in 2 ways, for example, as 316730332944 + 1545183246916 = 562788^2 + 1243054^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1861913579792 and 1861913579801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861913579861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46547839477 + ... + 46547839516.

It is an arithmetic number, because the mean of its divisors is an integer number (325834876479).

Almost surely, 2^{1861913579860} is an apocalyptic number.

1861913579860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1861913579860 is an abundant number, since it is smaller than the sum of its proper divisors (2048104937888).

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

1861913579860 is a wasteful number, since it uses less digits than its factorization.

1861913579860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93095679002 (or 93095679000 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 64.

The spelling of 1861913579860 in words is "one trillion, eight hundred sixty-one billion, nine hundred thirteen million, five hundred seventy-nine thousand, eight hundred sixty".