642859505958277 has 2 divisors, whose sum is σ = 642859505958278. Its totient is φ = 642859505958276.

The previous prime is 642859505958221. The next prime is 642859505958281. The reversal of 642859505958277 is 772859505958246.

642859505958277 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 522204351907681 + 120655154050596 = 22851791^2 + 10984314^2 .

It is a cyclic number.

It is not a de Polignac number, because 642859505958277 - 2¹⁹ = 642859505433989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642859505958277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642859505958287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321429752979138 + 321429752979139.

It is an arithmetic number, because the mean of its divisors is an integer number (321429752979139).

Almost surely, 2^{642859505958277} is an apocalyptic number.

It is an amenable number.

642859505958277 is a deficient number, since it is larger than the sum of its proper divisors (1).

642859505958277 is an equidigital number, since it uses as much as digits as its factorization.

642859505958277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960000, while the sum is 82.

The spelling of 642859505958277 in words is "six hundred forty-two trillion, eight hundred fifty-nine billion, five hundred five million, nine hundred fifty-eight thousand, two hundred seventy-seven".