166761013 has 2 divisors, whose sum is σ = 166761014. Its totient is φ = 166761012.

The previous prime is 166761011. The next prime is 166761019. The reversal of 166761013 is 310167661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148425489 + 18335524 = 12183^2 + 4282^2 .

It is a cyclic number.

It is not a de Polignac number, because 166761013 - 2¹ = 166761011 is a prime.

Together with 166761011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166761011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83380506 + 83380507.

It is an arithmetic number, because the mean of its divisors is an integer number (83380507).

Almost surely, 2^166761013 is an apocalyptic number.

It is an amenable number.

166761013 is a deficient number, since it is larger than the sum of its proper divisors (1).

166761013 is an equidigital number, since it uses as much as digits as its factorization.

166761013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 166761013 is about 12913.5979881674. The cubic root of 166761013 is about 550.4250301374.

It can be divided in two parts, 16676 and 1013, that added together give a square (17689 = 133²).

The spelling of 166761013 in words is "one hundred sixty-six million, seven hundred sixty-one thousand, thirteen".