20816605153 has 2 divisors, whose sum is σ = 20816605154. Its totient is φ = 20816605152.

The previous prime is 20816605141. The next prime is 20816605207. The reversal of 20816605153 is 35150661802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13648781584 + 7167823569 = 116828^2 + 84663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20816605153 is a prime.

It is not a weakly prime, because it can be changed into another prime (20816605253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10408302576 + 10408302577.

It is an arithmetic number, because the mean of its divisors is an integer number (10408302577).

Almost surely, 2^20816605153 is an apocalyptic number.

It is an amenable number.

20816605153 is a deficient number, since it is larger than the sum of its proper divisors (1).

20816605153 is an equidigital number, since it uses as much as digits as its factorization.

20816605153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 20816605153 in words is "twenty billion, eight hundred sixteen million, six hundred five thousand, one hundred fifty-three".