20150216173 has 2 divisors, whose sum is σ = 20150216174. Its totient is φ = 20150216172.

The previous prime is 20150216083. The next prime is 20150216183. The reversal of 20150216173 is 37161205102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15658267689 + 4491948484 = 125133^2 + 67022^2 .

It is a cyclic number.

It is not a de Polignac number, because 20150216173 - 2¹⁷ = 20150085101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20150216183) 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, 10075108086 + 10075108087.

It is an arithmetic number, because the mean of its divisors is an integer number (10075108087).

Almost surely, 2^20150216173 is an apocalyptic number.

It is an amenable number.

20150216173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20150216173 is an equidigital number, since it uses as much as digits as its factorization.

20150216173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The spelling of 20150216173 in words is "twenty billion, one hundred fifty million, two hundred sixteen thousand, one hundred seventy-three".