686545062077449 has 4 divisors (see below), whose sum is σ = 686546781069460. Its totient is φ = 686543343085440.

The previous prime is 686545062077401. The next prime is 686545062077467. The reversal of 686545062077449 is 944770260545686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31302458419600 + 655242603657849 = 5594860^2 + 25597707^2 .

It is a cyclic number.

It is not a de Polignac number, because 686545062077449 - 2²³ = 686545053688841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686045062077449) 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 in 3 ways as a sum of consecutive naturals, for example, 858896784 + ... + 859695745.

It is an arithmetic number, because the mean of its divisors is an integer number (171636695267365).

Almost surely, 2^{686545062077449} is an apocalyptic number.

It is an amenable number.

686545062077449 is a deficient number, since it is larger than the sum of its proper divisors (1718992011).

686545062077449 is a wasteful number, since it uses less digits than its factorization.

686545062077449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718992010.

The product of its (nonzero) digits is 2438553600, while the sum is 73.

The spelling of 686545062077449 in words is "six hundred eighty-six trillion, five hundred forty-five billion, sixty-two million, seventy-seven thousand, four hundred forty-nine".