20727606161 has 2 divisors, whose sum is σ = 20727606162. Its totient is φ = 20727606160.

The previous prime is 20727606149. The next prime is 20727606173. The reversal of 20727606161 is 16160672702.

It is a balanced prime because it is at equal distance from previous prime (20727606149) and next prime (20727606173).

It can be written as a sum of positive squares in only one way, i.e., 15960532225 + 4767073936 = 126335^2 + 69044^2 .

It is a cyclic number.

It is not a de Polignac number, because 20727606161 - 2¹⁰ = 20727605137 is a prime.

It is not a weakly prime, because it can be changed into another prime (20727606101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363803080 + 10363803081.

It is an arithmetic number, because the mean of its divisors is an integer number (10363803081).

Almost surely, 2^20727606161 is an apocalyptic number.

It is an amenable number.

20727606161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20727606161 is an equidigital number, since it uses as much as digits as its factorization.

20727606161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 20727606161 in words is "twenty billion, seven hundred twenty-seven million, six hundred six thousand, one hundred sixty-one".