684279891013 has 2 divisors, whose sum is σ = 684279891014. Its totient is φ = 684279891012.

The previous prime is 684279890969. The next prime is 684279891023. The reversal of 684279891013 is 310198972486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443127199684 + 241152691329 = 665678^2 + 491073^2 .

It is a cyclic number.

It is not a de Polignac number, because 684279891013 - 2²⁵ = 684246336581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684279891023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342139945506 + 342139945507.

It is an arithmetic number, because the mean of its divisors is an integer number (342139945507).

Almost surely, 2^684279891013 is an apocalyptic number.

It is an amenable number.

684279891013 is a deficient number, since it is larger than the sum of its proper divisors (1).

684279891013 is an equidigital number, since it uses as much as digits as its factorization.

684279891013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The spelling of 684279891013 in words is "six hundred eighty-four billion, two hundred seventy-nine million, eight hundred ninety-one thousand, thirteen".