506239684681 has 2 divisors, whose sum is σ = 506239684682. Its totient is φ = 506239684680.

The previous prime is 506239684667. The next prime is 506239684721. The reversal of 506239684681 is 186486932605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 496307569081 + 9932115600 = 704491^2 + 99660^2 .

It is a cyclic number.

It is not a de Polignac number, because 506239684681 - 2⁹ = 506239684169 is a prime.

It is a super-2 number, since 2×506239684681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (506239684631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253119842340 + 253119842341.

It is an arithmetic number, because the mean of its divisors is an integer number (253119842341).

Almost surely, 2^506239684681 is an apocalyptic number.

It is an amenable number.

506239684681 is a deficient number, since it is larger than the sum of its proper divisors (1).

506239684681 is an equidigital number, since it uses as much as digits as its factorization.

506239684681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 58.

The spelling of 506239684681 in words is "five hundred six billion, two hundred thirty-nine million, six hundred eighty-four thousand, six hundred eighty-one".