689386562873557 has 2 divisors, whose sum is σ = 689386562873558. Its totient is φ = 689386562873556.

The previous prime is 689386562873551. The next prime is 689386562873609. The reversal of 689386562873557 is 755378265683986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 439193920958116 + 250192641915441 = 20956954^2 + 15817479^2 .

It is a cyclic number.

It is not a de Polignac number, because 689386562873557 - 2¹⁹ = 689386562349269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689386562873551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344693281436778 + 344693281436779.

It is an arithmetic number, because the mean of its divisors is an integer number (344693281436779).

Almost surely, 2^{689386562873557} is an apocalyptic number.

It is an amenable number.

689386562873557 is a deficient number, since it is larger than the sum of its proper divisors (1).

689386562873557 is an equidigital number, since it uses as much as digits as its factorization.

689386562873557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109734912000, while the sum is 88.

The spelling of 689386562873557 in words is "six hundred eighty-nine trillion, three hundred eighty-six billion, five hundred sixty-two million, eight hundred seventy-three thousand, five hundred fifty-seven".