16620550631101 has 2 divisors, whose sum is σ = 16620550631102. Its totient is φ = 16620550631100.

The previous prime is 16620550631099. The next prime is 16620550631141. The reversal of 16620550631101 is 10113605502661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16005008391876 + 615542239225 = 4000626^2 + 784565^2 .

It is an emirp because it is prime and its reverse (10113605502661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16620550631101 - 2¹ = 16620550631099 is a prime.

Together with 16620550631099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16620550631141) 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, 8310275315550 + 8310275315551.

It is an arithmetic number, because the mean of its divisors is an integer number (8310275315551).

Almost surely, 2^{16620550631101} is an apocalyptic number.

It is an amenable number.

16620550631101 is a deficient number, since it is larger than the sum of its proper divisors (1).

16620550631101 is an equidigital number, since it uses as much as digits as its factorization.

16620550631101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 16620550631101 in words is "sixteen trillion, six hundred twenty billion, five hundred fifty million, six hundred thirty-one thousand, one hundred one".