172666013 has 8 divisors (see below), whose sum is σ = 190974168. Its totient is φ = 155075904.

The previous prime is 172666009. The next prime is 172666033. The reversal of 172666013 is 310666271.

172666013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 81234169 + 91431844 = 9013^2 + 9562^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 172666013 - 2² = 172666009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172666003) 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, 179006 + ... + 179967.

It is an arithmetic number, because the mean of its divisors is an integer number (23871771).

Almost surely, 2^172666013 is an apocalyptic number.

172666013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

172666013 is a deficient number, since it is larger than the sum of its proper divisors (18308155).

172666013 is a wasteful number, since it uses less digits than its factorization.

172666013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359023.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 172666013 is about 13140.2440236093. The cubic root of 172666013 is about 556.8466615675.

The spelling of 172666013 in words is "one hundred seventy-two million, six hundred sixty-six thousand, thirteen".