1781282019812 has 24 divisors (see below), whose sum is σ = 3131849671104. Its totient is φ = 886470018912.

The previous prime is 1781282019791. The next prime is 1781282019817. The reversal of 1781282019812 is 2189102821871.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1781282019817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3003218 + ... + 3547094.

It is an arithmetic number, because the mean of its divisors is an integer number (130493736296).

Almost surely, 2^{1781282019812} is an apocalyptic number.

It is an amenable number.

1781282019812 is a deficient number, since it is larger than the sum of its proper divisors (1350567651292).

1781282019812 is a wasteful number, since it uses less digits than its factorization.

1781282019812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547715 (or 547713 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 50.

The spelling of 1781282019812 in words is "one trillion, seven hundred eighty-one billion, two hundred eighty-two million, nineteen thousand, eight hundred twelve".