171909943953 has 128 divisors (see below), whose sum is σ = 278700687360. Its totient is φ = 93091680000.

The previous prime is 171909943943. The next prime is 171909943957. The reversal of 171909943953 is 359349909171.

It is not a de Polignac number, because 171909943953 - 2⁵ = 171909943921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171909943957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 131529526 + ... + 131530832.

It is an arithmetic number, because the mean of its divisors is an integer number (2177349120).

Almost surely, 2^171909943953 is an apocalyptic number.

It is an amenable number.

171909943953 is a deficient number, since it is larger than the sum of its proper divisors (106790743407).

171909943953 is a wasteful number, since it uses less digits than its factorization.

171909943953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539.

The product of its (nonzero) digits is 8266860, while the sum is 60.

The spelling of 171909943953 in words is "one hundred seventy-one billion, nine hundred nine million, nine hundred forty-three thousand, nine hundred fifty-three".