171844744493 has 2 divisors, whose sum is σ = 171844744494. Its totient is φ = 171844744492.

The previous prime is 171844744483. The next prime is 171844744507. The reversal of 171844744493 is 394447448171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166335096964 + 5509647529 = 407842^2 + 74227^2 .

It is a cyclic number.

It is not a de Polignac number, because 171844744493 - 2⁶ = 171844744429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171844744483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85922372246 + 85922372247.

It is an arithmetic number, because the mean of its divisors is an integer number (85922372247).

Almost surely, 2^171844744493 is an apocalyptic number.

It is an amenable number.

171844744493 is a deficient number, since it is larger than the sum of its proper divisors (1).

171844744493 is an equidigital number, since it uses as much as digits as its factorization.

171844744493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10838016, while the sum is 56.

The spelling of 171844744493 in words is "one hundred seventy-one billion, eight hundred forty-four million, seven hundred forty-four thousand, four hundred ninety-three".