1781216012568 has 32 divisors (see below), whose sum is σ = 4714983563760. Its totient is φ = 558812866560.

The previous prime is 1781216012533. The next prime is 1781216012593. The reversal of 1781216012568 is 8652106121871.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2182862353 + ... + 2182863168.

Almost surely, 2^{1781216012568} is an apocalyptic number.

It is an amenable number.

1781216012568 is an abundant number, since it is smaller than the sum of its proper divisors (2933767551192).

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

1781216012568 is a wasteful number, since it uses less digits than its factorization.

1781216012568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4365725547 (or 4365725543 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 48.

The spelling of 1781216012568 in words is "one trillion, seven hundred eighty-one billion, two hundred sixteen million, twelve thousand, five hundred sixty-eight".