166366740523 has 2 divisors, whose sum is σ = 166366740524. Its totient is φ = 166366740522.

The previous prime is 166366740521. The next prime is 166366740587. The reversal of 166366740523 is 325047663661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166366740523 - 2¹ = 166366740521 is a prime.

Together with 166366740521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166366740521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83183370261 + 83183370262.

It is an arithmetic number, because the mean of its divisors is an integer number (83183370262).

Almost surely, 2^166366740523 is an apocalyptic number.

166366740523 is a deficient number, since it is larger than the sum of its proper divisors (1).

166366740523 is an equidigital number, since it uses as much as digits as its factorization.

166366740523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 49.

The spelling of 166366740523 in words is "one hundred sixty-six billion, three hundred sixty-six million, seven hundred forty thousand, five hundred twenty-three".