171961684423 has 2 divisors, whose sum is σ = 171961684424. Its totient is φ = 171961684422.

The previous prime is 171961684387. The next prime is 171961684469. The reversal of 171961684423 is 324486169171.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171961684423 - 2¹³ = 171961676231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171961687423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85980842211 + 85980842212.

It is an arithmetic number, because the mean of its divisors is an integer number (85980842212).

Almost surely, 2^171961684423 is an apocalyptic number.

171961684423 is a deficient number, since it is larger than the sum of its proper divisors (1).

171961684423 is an equidigital number, since it uses as much as digits as its factorization.

171961684423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 52.

The spelling of 171961684423 in words is "one hundred seventy-one billion, nine hundred sixty-one million, six hundred eighty-four thousand, four hundred twenty-three".