20648330161649 has 2 divisors, whose sum is σ = 20648330161650. Its totient is φ = 20648330161648.

The previous prime is 20648330161577. The next prime is 20648330161727. The reversal of 20648330161649 is 94616103384602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12503699107249 + 8144631054400 = 3536057^2 + 2853880^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648330161649 - 2³² = 20644035194353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20648330161649.

It is not a weakly prime, because it can be changed into another prime (20648330160649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324165080824 + 10324165080825.

It is an arithmetic number, because the mean of its divisors is an integer number (10324165080825).

Almost surely, 2^{20648330161649} is an apocalyptic number.

It is an amenable number.

20648330161649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648330161649 is an equidigital number, since it uses as much as digits as its factorization.

20648330161649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 53.

The spelling of 20648330161649 in words is "twenty trillion, six hundred forty-eight billion, three hundred thirty million, one hundred sixty-one thousand, six hundred forty-nine".