40857856829 has 2 divisors, whose sum is σ = 40857856830. Its totient is φ = 40857856828.

The previous prime is 40857856799. The next prime is 40857856889. The reversal of 40857856829 is 92865875804.

40857856829 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28909180729 + 11948676100 = 170027^2 + 109310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40857856829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40857856889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20428928414 + 20428928415.

It is an arithmetic number, because the mean of its divisors is an integer number (20428928415).

Almost surely, 2^40857856829 is an apocalyptic number.

It is an amenable number.

40857856829 is a deficient number, since it is larger than the sum of its proper divisors (1).

40857856829 is an equidigital number, since it uses as much as digits as its factorization.

40857856829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38707200, while the sum is 62.

The spelling of 40857856829 in words is "forty billion, eight hundred fifty-seven million, eight hundred fifty-six thousand, eight hundred twenty-nine".