686370552678 has 12 divisors (see below), whose sum is σ = 1487136197508. Its totient is φ = 228790184220.

The previous prime is 686370552677. The next prime is 686370552811. The reversal of 686370552678 is 876255073686.

It is a happy number.

686370552678 is a `hidden beast` number, since 6 + 8 + 6 + 3 + 7 + 0 + 552 + 6 + 78 = 666.

It is a super-2 number, since 2×686370552678² (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 (686370552677) 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, 19065848668 + ... + 19065848703.

It is an arithmetic number, because the mean of its divisors is an integer number (123928016459).

Almost surely, 2^686370552678 is an apocalyptic number.

686370552678 is an abundant number, since it is smaller than the sum of its proper divisors (800765644830).

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

686370552678 is a wasteful number, since it uses less digits than its factorization.

686370552678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38131697379 (or 38131697376 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 63.

The spelling of 686370552678 in words is "six hundred eighty-six billion, three hundred seventy million, five hundred fifty-two thousand, six hundred seventy-eight".