161617964147 has 2 divisors, whose sum is σ = 161617964148. Its totient is φ = 161617964146.

The previous prime is 161617964143. The next prime is 161617964159. The reversal of 161617964147 is 741469716161.

161617964147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161617964147 - 2² = 161617964143 is a prime.

It is a super-2 number, since 2×161617964147² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161617964143) 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, 80808982073 + 80808982074.

It is an arithmetic number, because the mean of its divisors is an integer number (80808982074).

Almost surely, 2^161617964147 is an apocalyptic number.

161617964147 is a deficient number, since it is larger than the sum of its proper divisors (1).

161617964147 is an equidigital number, since it uses as much as digits as its factorization.

161617964147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 53.

The spelling of 161617964147 in words is "one hundred sixty-one billion, six hundred seventeen million, nine hundred sixty-four thousand, one hundred forty-seven".