42881806129957 has 2 divisors, whose sum is σ = 42881806129958. Its totient is φ = 42881806129956.

The previous prime is 42881806129931. The next prime is 42881806130011. The reversal of 42881806129957 is 75992160818824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31435858619361 + 11445947510596 = 5606769^2 + 3383186^2 .

It is a cyclic number.

It is not a de Polignac number, because 42881806129957 - 2⁷ = 42881806129829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42881806129907) 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 as a sum of consecutive naturals, namely, 21440903064978 + 21440903064979.

It is an arithmetic number, because the mean of its divisors is an integer number (21440903064979).

Almost surely, 2^{42881806129957} is an apocalyptic number.

It is an amenable number.

42881806129957 is a deficient number, since it is larger than the sum of its proper divisors (1).

42881806129957 is an equidigital number, since it uses as much as digits as its factorization.

42881806129957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139345920, while the sum is 70.

The spelling of 42881806129957 in words is "forty-two trillion, eight hundred eighty-one billion, eight hundred six million, one hundred twenty-nine thousand, nine hundred fifty-seven".