684041718541 has 2 divisors, whose sum is σ = 684041718542. Its totient is φ = 684041718540.

The previous prime is 684041718527. The next prime is 684041718551. The reversal of 684041718541 is 145817140486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 545560981641 + 138480736900 = 738621^2 + 372130^2 .

It is a cyclic number.

It is not a de Polignac number, because 684041718541 - 2¹⁷ = 684041587469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684041718551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342020859270 + 342020859271.

It is an arithmetic number, because the mean of its divisors is an integer number (342020859271).

Almost surely, 2^684041718541 is an apocalyptic number.

It is an amenable number.

684041718541 is a deficient number, since it is larger than the sum of its proper divisors (1).

684041718541 is an equidigital number, since it uses as much as digits as its factorization.

684041718541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 860160, while the sum is 49.

The spelling of 684041718541 in words is "six hundred eighty-four billion, forty-one million, seven hundred eighteen thousand, five hundred forty-one".