501836686861 has 2 divisors, whose sum is σ = 501836686862. Its totient is φ = 501836686860.

The previous prime is 501836686843. The next prime is 501836686873. The reversal of 501836686861 is 168686638105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 501051622500 + 785064361 = 707850^2 + 28019^2 .

It is a cyclic number.

It is not a de Polignac number, because 501836686861 - 2¹³ = 501836678669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 501836686796 and 501836686805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501836686811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250918343430 + 250918343431.

It is an arithmetic number, because the mean of its divisors is an integer number (250918343431).

Almost surely, 2^501836686861 is an apocalyptic number.

It is an amenable number.

501836686861 is a deficient number, since it is larger than the sum of its proper divisors (1).

501836686861 is an equidigital number, since it uses as much as digits as its factorization.

501836686861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9953280, while the sum is 58.

The spelling of 501836686861 in words is "five hundred one billion, eight hundred thirty-six million, six hundred eighty-six thousand, eight hundred sixty-one".