171445886449 has 2 divisors, whose sum is σ = 171445886450. Its totient is φ = 171445886448.

The previous prime is 171445886441. The next prime is 171445886461. The reversal of 171445886449 is 944688544171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161920126449 + 9525760000 = 402393^2 + 97600^2 .

It is a cyclic number.

It is not a de Polignac number, because 171445886449 - 2³ = 171445886441 is a prime.

It is not a weakly prime, because it can be changed into another prime (171445886441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85722943224 + 85722943225.

It is an arithmetic number, because the mean of its divisors is an integer number (85722943225).

Almost surely, 2^171445886449 is an apocalyptic number.

It is an amenable number.

171445886449 is a deficient number, since it is larger than the sum of its proper divisors (1).

171445886449 is an equidigital number, since it uses as much as digits as its factorization.

171445886449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30965760, while the sum is 61.

The spelling of 171445886449 in words is "one hundred seventy-one billion, four hundred forty-five million, eight hundred eighty-six thousand, four hundred forty-nine".