684861108623 has 2 divisors, whose sum is σ = 684861108624. Its totient is φ = 684861108622.

The previous prime is 684861108601. The next prime is 684861108677. The reversal of 684861108623 is 326801168486.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 684861108623 - 2³⁶ = 616141631887 is a prime.

It is a super-2 number, since 2×684861108623² (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 (684861108023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342430554311 + 342430554312.

It is an arithmetic number, because the mean of its divisors is an integer number (342430554312).

Almost surely, 2^684861108623 is an apocalyptic number.

684861108623 is a deficient number, since it is larger than the sum of its proper divisors (1).

684861108623 is an equidigital number, since it uses as much as digits as its factorization.

684861108623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2654208, while the sum is 53.

The spelling of 684861108623 in words is "six hundred eighty-four billion, eight hundred sixty-one million, one hundred eight thousand, six hundred twenty-three".