42689420857 has 2 divisors, whose sum is σ = 42689420858. Its totient is φ = 42689420856.

The previous prime is 42689420843. The next prime is 42689420861. The reversal of 42689420857 is 75802498624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33569934841 + 9119486016 = 183221^2 + 95496^2 .

It is a cyclic number.

It is not a de Polignac number, because 42689420857 - 2⁷ = 42689420729 is a prime.

It is a super-3 number, since 3×42689420857³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 42689420798 and 42689420807.

It is not a weakly prime, because it can be changed into another prime (42689420887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21344710428 + 21344710429.

It is an arithmetic number, because the mean of its divisors is an integer number (21344710429).

Almost surely, 2^42689420857 is an apocalyptic number.

It is an amenable number.

42689420857 is a deficient number, since it is larger than the sum of its proper divisors (1).

42689420857 is an equidigital number, since it uses as much as digits as its factorization.

42689420857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 42689420857 in words is "forty-two billion, six hundred eighty-nine million, four hundred twenty thousand, eight hundred fifty-seven".