40782434821 has 2 divisors, whose sum is σ = 40782434822. Its totient is φ = 40782434820.

The previous prime is 40782434773. The next prime is 40782434921. The reversal of 40782434821 is 12843428704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31042916100 + 9739518721 = 176190^2 + 98689^2 .

It is a cyclic number.

It is not a de Polignac number, because 40782434821 - 2²¹ = 40780337669 is a prime.

It is a super-2 number, since 2×40782434821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40782434321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20391217410 + 20391217411.

It is an arithmetic number, because the mean of its divisors is an integer number (20391217411).

Almost surely, 2^40782434821 is an apocalyptic number.

It is an amenable number.

40782434821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40782434821 is an equidigital number, since it uses as much as digits as its factorization.

40782434821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 344064, while the sum is 43.

The spelling of 40782434821 in words is "forty billion, seven hundred eighty-two million, four hundred thirty-four thousand, eight hundred twenty-one".