687857363573 has 2 divisors, whose sum is σ = 687857363574. Its totient is φ = 687857363572.

The previous prime is 687857363509. The next prime is 687857363579. The reversal of 687857363573 is 375363758786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657099920689 + 30757442884 = 810617^2 + 175378^2 .

It is a cyclic number.

It is not a de Polignac number, because 687857363573 - 2⁶ = 687857363509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687857363579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343928681786 + 343928681787.

It is an arithmetic number, because the mean of its divisors is an integer number (343928681787).

Almost surely, 2^687857363573 is an apocalyptic number.

It is an amenable number.

687857363573 is a deficient number, since it is larger than the sum of its proper divisors (1).

687857363573 is an equidigital number, since it uses as much as digits as its factorization.

687857363573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 533433600, while the sum is 68.

The spelling of 687857363573 in words is "six hundred eighty-seven billion, eight hundred fifty-seven million, three hundred sixty-three thousand, five hundred seventy-three".