1861213978732 has 12 divisors (see below), whose sum is σ = 3296366926776. Its totient is φ = 919394856800.

The previous prime is 1861213978711. The next prime is 1861213978763. The reversal of 1861213978732 is 2378793121681.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2803032769 + ... + 2803033432.

It is an arithmetic number, because the mean of its divisors is an integer number (274697243898).

Almost surely, 2^{1861213978732} is an apocalyptic number.

It is an amenable number.

1861213978732 is a deficient number, since it is larger than the sum of its proper divisors (1435152948044).

1861213978732 is a wasteful number, since it uses less digits than its factorization.

1861213978732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606066288 (or 5606066286 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 58.

The spelling of 1861213978732 in words is "one trillion, eight hundred sixty-one billion, two hundred thirteen million, nine hundred seventy-eight thousand, seven hundred thirty-two".