20859082251061 has 2 divisors, whose sum is σ = 20859082251062. Its totient is φ = 20859082251060.

The previous prime is 20859082251041. The next prime is 20859082251121. The reversal of 20859082251061 is 16015228095802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20268499223025 + 590583028036 = 4502055^2 + 768494^2 .

It is a cyclic number.

It is not a de Polignac number, because 20859082251061 - 2¹⁹ = 20859081726773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20859082250996 and 20859082251014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20859082251041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429541125530 + 10429541125531.

It is an arithmetic number, because the mean of its divisors is an integer number (10429541125531).

Almost surely, 2^{20859082251061} is an apocalyptic number.

It is an amenable number.

20859082251061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20859082251061 is an equidigital number, since it uses as much as digits as its factorization.

20859082251061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 20859082251061 in words is "twenty trillion, eight hundred fifty-nine billion, eighty-two million, two hundred fifty-one thousand, sixty-one".