686501811936 has 36 divisors (see below), whose sum is σ = 1952239528512. Its totient is φ = 228833937216.

The previous prime is 686501811913. The next prime is 686501811937. The reversal of 686501811936 is 639118105686.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×686501811936² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686501811937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1191843136 + ... + 1191843711.

It is an arithmetic number, because the mean of its divisors is an integer number (54228875792).

Almost surely, 2^686501811936 is an apocalyptic number.

It is an amenable number.

686501811936 is an abundant number, since it is smaller than the sum of its proper divisors (1265737716576).

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

686501811936 is a wasteful number, since it uses less digits than its factorization.

686501811936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383686863 (or 2383686852 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 686501811936 in words is "six hundred eighty-six billion, five hundred one million, eight hundred eleven thousand, nine hundred thirty-six".