20646100600553 has 2 divisors, whose sum is σ = 20646100600554. Its totient is φ = 20646100600552.

The previous prime is 20646100600511. The next prime is 20646100600591. The reversal of 20646100600553 is 35500600164602.

It is a happy number.

It is an a-pointer prime, because the next prime (20646100600591) can be obtained adding 20646100600553 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17243355910144 + 3402744690409 = 4152512^2 + 1844653^2 .

It is a cyclic number.

It is not a de Polignac number, because 20646100600553 - 2¹⁰ = 20646100599529 is a prime.

It is a super-2 number, since 2×20646100600553² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20646100200553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10323050300276 + 10323050300277.

It is an arithmetic number, because the mean of its divisors is an integer number (10323050300277).

Almost surely, 2^{20646100600553} is an apocalyptic number.

It is an amenable number.

20646100600553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20646100600553 is an equidigital number, since it uses as much as digits as its factorization.

20646100600553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 20646100600553 in words is "twenty trillion, six hundred forty-six billion, one hundred million, six hundred thousand, five hundred fifty-three".