161671106447 has 2 divisors, whose sum is σ = 161671106448. Its totient is φ = 161671106446.

The previous prime is 161671106423. The next prime is 161671106497. The reversal of 161671106447 is 744601176161.

It is a weak prime.

It is an emirp because it is prime and its reverse (744601176161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161671106447 - 2⁶ = 161671106383 is a prime.

It is a super-2 number, since 2×161671106447² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161671106398 and 161671106407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161671106417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80835553223 + 80835553224.

It is an arithmetic number, because the mean of its divisors is an integer number (80835553224).

Almost surely, 2^161671106447 is an apocalyptic number.

161671106447 is a deficient number, since it is larger than the sum of its proper divisors (1).

161671106447 is an equidigital number, since it uses as much as digits as its factorization.

161671106447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 161671106447 in words is "one hundred sixty-one billion, six hundred seventy-one million, one hundred six thousand, four hundred forty-seven".