20107158161 has 2 divisors, whose sum is σ = 20107158162. Its totient is φ = 20107158160.

The previous prime is 20107158133. The next prime is 20107158173. The reversal of 20107158161 is 16185170102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15718890625 + 4388267536 = 125375^2 + 66244^2 .

It is a cyclic number.

It is not a de Polignac number, because 20107158161 - 2²² = 20102963857 is a prime.

It is a super-2 number, since 2×20107158161² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20107158121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10053579080 + 10053579081.

It is an arithmetic number, because the mean of its divisors is an integer number (10053579081).

Almost surely, 2^20107158161 is an apocalyptic number.

It is an amenable number.

20107158161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20107158161 is an equidigital number, since it uses as much as digits as its factorization.

20107158161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 32.

The spelling of 20107158161 in words is "twenty billion, one hundred seven million, one hundred fifty-eight thousand, one hundred sixty-one".