686655456771136 has 14 divisors (see below), whose sum is σ = 1362581922030350. Its totient is φ = 343327728385536.

The previous prime is 686655456771121. The next prime is 686655456771139. The reversal of 686655456771136 is 631177654556686.

It can be written as a sum of positive squares in only one way, i.e., 650917251086400 + 35738205684736 = 25513080^2 + 5978144^2 .

It is not an unprimeable number, because it can be changed into a prime (686655456771139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5364495755961 + ... + 5364495756088.

It is an arithmetic number, because the mean of its divisors is an integer number (97327280145025).

Almost surely, 2^{686655456771136} is an apocalyptic number.

It is an amenable number.

686655456771136 is a deficient number, since it is larger than the sum of its proper divisors (675926465259214).

686655456771136 is a wasteful number, since it uses less digits than its factorization.

686655456771136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10728991512061 (or 10728991512051 counting only the distinct ones).

The product of its digits is 4572288000, while the sum is 76.

The spelling of 686655456771136 in words is "six hundred eighty-six trillion, six hundred fifty-five billion, four hundred fifty-six million, seven hundred seventy-one thousand, one hundred thirty-six".