20616981101 has 2 divisors, whose sum is σ = 20616981102. Its totient is φ = 20616981100.

The previous prime is 20616981089. The next prime is 20616981103. The reversal of 20616981101 is 10118961602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16867255876 + 3749725225 = 129874^2 + 61235^2 .

It is a cyclic number.

It is not a de Polignac number, because 20616981101 - 2¹⁰ = 20616980077 is a prime.

Together with 20616981103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20616981103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308490550 + 10308490551.

It is an arithmetic number, because the mean of its divisors is an integer number (10308490551).

Almost surely, 2^20616981101 is an apocalyptic number.

It is an amenable number.

20616981101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616981101 is an equidigital number, since it uses as much as digits as its factorization.

20616981101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 20616981101 in words is "twenty billion, six hundred sixteen million, nine hundred eighty-one thousand, one hundred one".