684581651213 has 4 divisors (see below), whose sum is σ = 690639896028. Its totient is φ = 678523406400.

The previous prime is 684581651203. The next prime is 684581651219. The reversal of 684581651213 is 312156185486.

684581651213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140117708329 + 544463942884 = 374323^2 + 737878^2 .

It is a cyclic number.

It is not a de Polignac number, because 684581651213 - 2⁸ = 684581650957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684581651219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3029122238 + ... + 3029122463.

It is an arithmetic number, because the mean of its divisors is an integer number (172659974007).

Almost surely, 2^684581651213 is an apocalyptic number.

It is an amenable number.

684581651213 is a deficient number, since it is larger than the sum of its proper divisors (6058244815).

684581651213 is a wasteful number, since it uses less digits than its factorization.

684581651213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6058244814.

The product of its digits is 1382400, while the sum is 50.

The spelling of 684581651213 in words is "six hundred eighty-four billion, five hundred eighty-one million, six hundred fifty-one thousand, two hundred thirteen".