172171717075 has 12 divisors (see below), whose sum is σ = 215891728920. Its totient is φ = 136189760960.

The previous prime is 172171717073. The next prime is 172171717121. The reversal of 172171717075 is 570717171271.

It is not a de Polignac number, because 172171717075 - 2¹ = 172171717073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172171717073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38688049 + ... + 38692498.

It is an arithmetic number, because the mean of its divisors is an integer number (17990977410).

Almost surely, 2^172171717075 is an apocalyptic number.

172171717075 is a deficient number, since it is larger than the sum of its proper divisors (43720011845).

172171717075 is an equidigital number, since it uses as much as digits as its factorization.

172171717075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77380646 (or 77380641 counting only the distinct ones).

The product of its (nonzero) digits is 168070, while the sum is 46.

The spelling of 172171717075 in words is "one hundred seventy-two billion, one hundred seventy-one million, seven hundred seventeen thousand, seventy-five".