686376077184 has 256 divisors, whose sum is σ = 2326807680000. Its totient is φ = 195120617472.

The previous prime is 686376077161. The next prime is 686376077209. The reversal of 686376077184 is 481770673686.

It is a happy number.

686376077184 is a `hidden beast` number, since 6 + 8 + 6 + 3 + 7 + 607 + 7 + 18 + 4 = 666.

It is a super-2 number, since 2×686376077184² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4742922 + ... + 4885494.

It is an arithmetic number, because the mean of its divisors is an integer number (9089092500).

Almost surely, 2^686376077184 is an apocalyptic number.

686376077184 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686376077184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1163403840000).

686376077184 is an abundant number, since it is smaller than the sum of its proper divisors (1640431602816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686376077184 is a wasteful number, since it uses less digits than its factorization.

686376077184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142802 (or 142784 counting only the distinct ones).

The product of its (nonzero) digits is 56899584, while the sum is 63.

The spelling of 686376077184 in words is "six hundred eighty-six billion, three hundred seventy-six million, seventy-seven thousand, one hundred eighty-four".