166513 has 4 divisors (see below), whose sum is σ = 168868. Its totient is φ = 164160.

The previous prime is 166487. The next prime is 166541. The reversal of 166513 is 315661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315661 = 479 ⋅659.

It can be written as a sum of positive squares in 2 ways, for example, as 97344 + 69169 = 312^2 + 263^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068 + ... + 1213.

It is an arithmetic number, because the mean of its divisors is an integer number (42217).

2¹⁶⁶⁵¹³ is an apocalyptic number.

It is an amenable number.

166513 is a deficient number, since it is larger than the sum of its proper divisors (2355).

166513 is an equidigital number, since it uses as much as digits as its factorization.

166513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354.

The product of its digits is 540, while the sum is 22.

The square root of 166513 is about 408.0600446013. The cubic root of 166513 is about 55.0152024091.

It can be divided in two parts, 166 and 513, that multiplied together give a palindrome (85158).

The spelling of 166513 in words is "one hundred sixty-six thousand, five hundred thirteen".