172166071 has 16 divisors (see below), whose sum is σ = 218292480. Its totient is φ = 131878080.

The previous prime is 172166051. The next prime is 172166077. The reversal of 172166071 is 170661271.

172166071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 172166071 - 2⁵ = 172166039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172166077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14406 + ... + 23491.

It is an arithmetic number, because the mean of its divisors is an integer number (13643280).

Almost surely, 2^172166071 is an apocalyptic number.

172166071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

172166071 is a deficient number, since it is larger than the sum of its proper divisors (46126409).

172166071 is a wasteful number, since it uses less digits than its factorization.

172166071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37974.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 172166071 is about 13121.2069185727. The cubic root of 172166071 is about 556.3087055661.

The spelling of 172166071 in words is "one hundred seventy-two million, one hundred sixty-six thousand, seventy-one".