684391196087 has 2 divisors, whose sum is σ = 684391196088. Its totient is φ = 684391196086.

The previous prime is 684391196017. The next prime is 684391196107. The reversal of 684391196087 is 780691193486.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684391196087 is a prime.

It is a super-2 number, since 2×684391196087² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684391196017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342195598043 + 342195598044.

It is an arithmetic number, because the mean of its divisors is an integer number (342195598044).

Almost surely, 2^684391196087 is an apocalyptic number.

684391196087 is a deficient number, since it is larger than the sum of its proper divisors (1).

684391196087 is an equidigital number, since it uses as much as digits as its factorization.

684391196087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 684391196087 in words is "six hundred eighty-four billion, three hundred ninety-one million, one hundred ninety-six thousand, eighty-seven".