161663676259873 has 2 divisors, whose sum is σ = 161663676259874. Its totient is φ = 161663676259872.

The previous prime is 161663676259739. The next prime is 161663676259927. The reversal of 161663676259873 is 378952676366161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153560499154209 + 8103177105664 = 12391953^2 + 2846608^2 .

It is an emirp because it is prime and its reverse (378952676366161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161663676259873 - 2²¹ = 161663674162721 is a prime.

It is a super-2 number, since 2×161663676259873² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161663676259873.

It is not a weakly prime, because it can be changed into another prime (161663676859873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80831838129936 + 80831838129937.

It is an arithmetic number, because the mean of its divisors is an integer number (80831838129937).

Almost surely, 2^{161663676259873} is an apocalyptic number.

It is an amenable number.

161663676259873 is a deficient number, since it is larger than the sum of its proper divisors (1).

161663676259873 is an equidigital number, since it uses as much as digits as its factorization.

161663676259873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2469035520, while the sum is 76.

The spelling of 161663676259873 in words is "one hundred sixty-one trillion, six hundred sixty-three billion, six hundred seventy-six million, two hundred fifty-nine thousand, eight hundred seventy-three".