171045724920649 has 4 divisors (see below), whose sum is σ = 180048131495440. Its totient is φ = 162043318345860.

The previous prime is 171045724920613. The next prime is 171045724920677. The reversal of 171045724920649 is 946029427540171.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 171045724920649 - 2¹⁹ = 171045724396361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171045724930649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4501203287367 + ... + 4501203287404.

It is an arithmetic number, because the mean of its divisors is an integer number (45012032873860).

Almost surely, 2^{171045724920649} is an apocalyptic number.

171045724920649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

171045724920649 is a deficient number, since it is larger than the sum of its proper divisors (9002406574791).

171045724920649 is an equidigital number, since it uses as much as digits as its factorization.

171045724920649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9002406574790.

The product of its (nonzero) digits is 30481920, while the sum is 61.

The spelling of 171045724920649 in words is "one hundred seventy-one trillion, forty-five billion, seven hundred twenty-four million, nine hundred twenty thousand, six hundred forty-nine".