1861943756672 has 16 divisors (see below), whose sum is σ = 3709341078000. Its totient is φ = 930971878272.

The previous prime is 1861943756669. The next prime is 1861943756693. The reversal of 1861943756672 is 2766573491681.

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 1861943756599 and 1861943756608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7273217672 + ... + 7273217927.

It is an arithmetic number, because the mean of its divisors is an integer number (231833817375).

Almost surely, 2^{1861943756672} is an apocalyptic number.

It is an amenable number.

1861943756672 is a deficient number, since it is larger than the sum of its proper divisors (1847397321328).

1861943756672 is an equidigital number, since it uses as much as digits as its factorization.

1861943756672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14546435613 (or 14546435601 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 65.

The spelling of 1861943756672 in words is "one trillion, eight hundred sixty-one billion, nine hundred forty-three million, seven hundred fifty-six thousand, six hundred seventy-two".