686232778016 has 24 divisors (see below), whose sum is σ = 1351052555580. Its totient is φ = 343108319488.

The previous prime is 686232778003. The next prime is 686232778039. The reversal of 686232778016 is 610877232686.

It can be written as a sum of positive squares in 2 ways, for example, as 661287734416 + 24945043600 = 813196^2 + 157940^2 .

It is an unprimeable number.

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, 1271330 + ... + 1728798.

Almost surely, 2^686232778016 is an apocalyptic number.

It is an amenable number.

686232778016 is a deficient number, since it is larger than the sum of its proper divisors (664819777564).

686232778016 is a wasteful number, since it uses less digits than its factorization.

686232778016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504356 (or 504348 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 686232778016 in words is "six hundred eighty-six billion, two hundred thirty-two million, seven hundred seventy-eight thousand, sixteen".