686364197841 has 27 divisors (see below), whose sum is σ = 1153307852073. Its totient is φ = 392198171400.

The previous prime is 686364197839. The next prime is 686364197867. The reversal of 686364197841 is 148791463686.

It is a happy number.

The square root of 686364197841 is 828471.

It is a perfect power (a square), and thus also a powerful number.

686364197841 is a `hidden beast` number, since 6 + 8 + 6 + 364 + 197 + 84 + 1 = 666.

It is not a de Polignac number, because 686364197841 - 2¹ = 686364197839 is a prime.

It is a super-2 number, since 2×686364197841² (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 not an unprimeable number, because it can be changed into a prime (686364197041) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 17378166 + ... + 17417616.

Almost surely, 2^686364197841 is an apocalyptic number.

686364197841 is the 828471-st square number.

686364197841 is the 414236-th centered octagonal number.

It is an amenable number.

686364197841 is a deficient number, since it is larger than the sum of its proper divisors (466943654232).

686364197841 is an frugal number, since it uses more digits than its factorization.

686364197841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78922 (or 39461 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 686364197841 in words is "six hundred eighty-six billion, three hundred sixty-four million, one hundred ninety-seven thousand, eight hundred forty-one".