684949834013 has 2 divisors, whose sum is σ = 684949834014. Its totient is φ = 684949834012.

The previous prime is 684949834003. The next prime is 684949834021. The reversal of 684949834013 is 310438949486.

684949834013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672601735129 + 12348098884 = 820123^2 + 111122^2 .

It is a cyclic number.

It is not a de Polignac number, because 684949834013 - 2¹² = 684949829917 is a prime.

It is a super-2 number, since 2×684949834013² (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 (684949834003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342474917006 + 342474917007.

It is an arithmetic number, because the mean of its divisors is an integer number (342474917007).

Almost surely, 2^684949834013 is an apocalyptic number.

It is an amenable number.

684949834013 is a deficient number, since it is larger than the sum of its proper divisors (1).

684949834013 is an equidigital number, since it uses as much as digits as its factorization.

684949834013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17915904, while the sum is 59.

The spelling of 684949834013 in words is "six hundred eighty-four billion, nine hundred forty-nine million, eight hundred thirty-four thousand, thirteen".