43452056781 has 72 divisors (see below), whose sum is σ = 77404314624. Its totient is φ = 23379088320.

The previous prime is 43452056779. The next prime is 43452056789. The reversal of 43452056781 is 18765025434.

43452056781 is a `hidden beast` number, since 4 + 3 + 4 + 5 + 2 + 0 + 567 + 81 = 666.

It is not a de Polignac number, because 43452056781 - 2¹ = 43452056779 is a prime.

It is a super-2 number, since 2×43452056781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43452056789) by changing a digit.

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 in 71 ways as a sum of consecutive naturals, for example, 462876 + ... + 548778.

Almost surely, 2^43452056781 is an apocalyptic number.

It is an amenable number.

43452056781 is a deficient number, since it is larger than the sum of its proper divisors (33952257843).

43452056781 is a wasteful number, since it uses less digits than its factorization.

43452056781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85991 (or 85981 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 43452056781 in words is "forty-three billion, four hundred fifty-two million, fifty-six thousand, seven hundred eighty-one".