20730157166161 has 2 divisors, whose sum is σ = 20730157166162. Its totient is φ = 20730157166160.

The previous prime is 20730157166123. The next prime is 20730157166219. The reversal of 20730157166161 is 16166175103702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17056437443136 + 3673719723025 = 4129944^2 + 1916695^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730157166161 - 2¹⁵ = 20730157133393 is a prime.

It is a super-2 number, since 2×20730157166161² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20730157166561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365078583080 + 10365078583081.

It is an arithmetic number, because the mean of its divisors is an integer number (10365078583081).

Almost surely, 2^{20730157166161} is an apocalyptic number.

It is an amenable number.

20730157166161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730157166161 is an equidigital number, since it uses as much as digits as its factorization.

20730157166161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 20730157166161 in words is "twenty trillion, seven hundred thirty billion, one hundred fifty-seven million, one hundred sixty-six thousand, one hundred sixty-one".