20161616155 has 4 divisors (see below), whose sum is σ = 24193939392. Its totient is φ = 16129292920.

The previous prime is 20161616131. The next prime is 20161616159. The reversal of 20161616155 is 55161616102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55161616102 = 2 ⋅27580808051.

It is a de Polignac number, because none of the positive numbers 2^k-20161616155 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20161616155.

It is not an unprimeable number, because it can be changed into a prime (20161616159) 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 in 3 ways as a sum of consecutive naturals, for example, 2016161611 + ... + 2016161620.

It is an arithmetic number, because the mean of its divisors is an integer number (6048484848).

Almost surely, 2^20161616155 is an apocalyptic number.

20161616155 is a deficient number, since it is larger than the sum of its proper divisors (4032323237).

20161616155 is an equidigital number, since it uses as much as digits as its factorization.

20161616155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032323236.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 20161616155 in words is "twenty billion, one hundred sixty-one million, six hundred sixteen thousand, one hundred fifty-five".