171385709257 has 8 divisors (see below), whose sum is σ = 195875309376. Its totient is φ = 146897590992.

The previous prime is 171385709237. The next prime is 171385709263. The reversal of 171385709257 is 752907583171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171385709257 is a prime.

It is a super-2 number, since 2×171385709257² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 171385709198 and 171385709207.

It is not an unprimeable number, because it can be changed into a prime (171385709237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110458 + ... + 595795.

It is an arithmetic number, because the mean of its divisors is an integer number (24484413672).

Almost surely, 2^171385709257 is an apocalyptic number.

It is an amenable number.

171385709257 is a deficient number, since it is larger than the sum of its proper divisors (24489600119).

171385709257 is an equidigital number, since it uses as much as digits as its factorization.

171385709257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740927.

The product of its (nonzero) digits is 3704400, while the sum is 55.

The spelling of 171385709257 in words is "one hundred seventy-one billion, three hundred eighty-five million, seven hundred nine thousand, two hundred fifty-seven".