684391196106 has 20 divisors (see below), whose sum is σ = 1533543236082. Its totient is φ = 228130398648.

The previous prime is 684391196087. The next prime is 684391196107. The reversal of 684391196106 is 601691193486.

It is a happy number.

684391196106 is a `hidden beast` number, since 6 + 8 + 4 + 3 + 9 + 1 + 19 + 610 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 660847055625 + 23544140481 = 812925^2 + 153441^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (684391196107) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2112318345 + ... + 2112318668.

Almost surely, 2^684391196106 is an apocalyptic number.

684391196106 is an abundant number, since it is smaller than the sum of its proper divisors (849152039976).

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

684391196106 is a wasteful number, since it uses less digits than its factorization.

684391196106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224637027 (or 4224637018 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 684391196106 in words is "six hundred eighty-four billion, three hundred ninety-one million, one hundred ninety-six thousand, one hundred six".