1811942751856 has 10 divisors (see below), whose sum is σ = 3510639081752. Its totient is φ = 905971375920.

The previous prime is 1811942751811. The next prime is 1811942751887. The reversal of 1811942751856 is 6581572491181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1811942751856.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56623210980 + ... + 56623211011.

Almost surely, 2^{1811942751856} is an apocalyptic number.

1811942751856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1811942751856 is a deficient number, since it is larger than the sum of its proper divisors (1698696329896).

1811942751856 is a wasteful number, since it uses less digits than its factorization.

1811942751856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113246421999 (or 113246421993 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 58.

The spelling of 1811942751856 in words is "one trillion, eight hundred eleven billion, nine hundred forty-two million, seven hundred fifty-one thousand, eight hundred fifty-six".