684715620481 has 2 divisors, whose sum is σ = 684715620482. Its totient is φ = 684715620480.

The previous prime is 684715620473. The next prime is 684715620517. The reversal of 684715620481 is 184026517486.

684715620481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360430928881 + 324284691600 = 600359^2 + 569460^2 .

It is a cyclic number.

It is not a de Polignac number, because 684715620481 - 2³ = 684715620473 is a prime.

It is a super-2 number, since 2×684715620481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (684715620431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342357810240 + 342357810241.

It is an arithmetic number, because the mean of its divisors is an integer number (342357810241).

Almost surely, 2^684715620481 is an apocalyptic number.

It is an amenable number.

684715620481 is a deficient number, since it is larger than the sum of its proper divisors (1).

684715620481 is an equidigital number, since it uses as much as digits as its factorization.

684715620481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 684715620481 in words is "six hundred eighty-four billion, seven hundred fifteen million, six hundred twenty thousand, four hundred eighty-one".