686696693760 has 1512 divisors, whose sum is σ = 3132841604256. Its totient is φ = 142690222080.

The previous prime is 686696693717. The next prime is 686696693801. The reversal of 686696693760 is 67396696686.

It is a tau number, because it is divible by the number of its divisors (1512).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 62426972155 + ... + 62426972165.

It is an arithmetic number, because the mean of its divisors is an integer number (2071985188).

Almost surely, 2^686696693760 is an apocalyptic number.

686696693760 is a gapful number since it is divisible by the number (60) 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 686696693760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1566420802128).

686696693760 is an abundant number, since it is smaller than the sum of its proper divisors (2446144910496).

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

686696693760 is an frugal number, since it uses more digits than its factorization.

686696693760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 634894848, while the sum is 72.

The spelling of 686696693760 in words is "six hundred eighty-six billion, six hundred ninety-six million, six hundred ninety-three thousand, seven hundred sixty".