166654513 has 2 divisors, whose sum is σ = 166654514. Its totient is φ = 166654512.

The previous prime is 166654511. The next prime is 166654517. The reversal of 166654513 is 315456661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158457744 + 8196769 = 12588^2 + 2863^2 .

It is a cyclic number.

It is not a de Polignac number, because 166654513 - 2¹ = 166654511 is a prime.

Together with 166654511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166654511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83327256 + 83327257.

It is an arithmetic number, because the mean of its divisors is an integer number (83327257).

Almost surely, 2^166654513 is an apocalyptic number.

It is an amenable number.

166654513 is a deficient number, since it is larger than the sum of its proper divisors (1).

166654513 is an equidigital number, since it uses as much as digits as its factorization.

166654513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 37.

The square root of 166654513 is about 12909.4737692905. The cubic root of 166654513 is about 550.3078309829.

The spelling of 166654513 in words is "one hundred sixty-six million, six hundred fifty-four thousand, five hundred thirteen".