42769782781 has 32 divisors (see below), whose sum is σ = 49612147200. Its totient is φ = 36462934080.

The previous prime is 42769782763. The next prime is 42769782787. The reversal of 42769782781 is 18728796724.

It is a cyclic number.

It is not a de Polignac number, because 42769782781 - 2⁹ = 42769782269 is a prime.

It is a super-2 number, since 2×42769782781² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42769782787) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 10834050 + ... + 10837996.

It is an arithmetic number, because the mean of its divisors is an integer number (1550379600).

Almost surely, 2^42769782781 is an apocalyptic number.

It is an amenable number.

42769782781 is a deficient number, since it is larger than the sum of its proper divisors (6842364419).

42769782781 is a wasteful number, since it uses less digits than its factorization.

42769782781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4489.

The product of its digits is 18966528, while the sum is 61.

The spelling of 42769782781 in words is "forty-two billion, seven hundred sixty-nine million, seven hundred eighty-two thousand, seven hundred eighty-one".