20122640166449 has 2 divisors, whose sum is σ = 20122640166450. Its totient is φ = 20122640166448.

The previous prime is 20122640166389. The next prime is 20122640166479. The reversal of 20122640166449 is 94466104622102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19876617222400 + 246022944049 = 4458320^2 + 496007^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122640166449 - 2⁴⁴ = 2530454122033 is a prime.

It is not a weakly prime, because it can be changed into another prime (20122640166479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061320083224 + 10061320083225.

It is an arithmetic number, because the mean of its divisors is an integer number (10061320083225).

Almost surely, 2^{20122640166449} is an apocalyptic number.

It is an amenable number.

20122640166449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122640166449 is an equidigital number, since it uses as much as digits as its factorization.

20122640166449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 47.

The spelling of 20122640166449 in words is "twenty trillion, one hundred twenty-two billion, six hundred forty million, one hundred sixty-six thousand, four hundred forty-nine".