678683131165 has 8 divisors (see below), whose sum is σ = 877067431128. Its totient is φ = 501181389120.

The previous prime is 678683131163. The next prime is 678683131207. The reversal of 678683131165 is 561131386876.

It is a happy number.

678683131165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 48305885796 + 630377245369 = 219786^2 + 793963^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 678683131165 - 2¹ = 678683131163 is a prime.

It is a super-2 number, since 2×678683131165² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678683131163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5220639406 + ... + 5220639535.

It is an arithmetic number, because the mean of its divisors is an integer number (109633428891).

Almost surely, 2^678683131165 is an apocalyptic number.

678683131165 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

678683131165 is a deficient number, since it is larger than the sum of its proper divisors (198384299963).

678683131165 is a wasteful number, since it uses less digits than its factorization.

678683131165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10441278959.

The product of its digits is 4354560, while the sum is 55.

The spelling of 678683131165 in words is "six hundred seventy-eight billion, six hundred eighty-three million, one hundred thirty-one thousand, one hundred sixty-five".