166403056642533 has 18 divisors (see below), whose sum is σ = 244364893674642. Its totient is φ = 109116758432160.

The previous prime is 166403056642507. The next prime is 166403056642607. The reversal of 166403056642533 is 335246650304661.

166403056642533 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 0 + 3 + 0 + 5 + 66 + 42 + 533 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 7351787570724 + 159051269071809 = 2711418^2 + 12611553^2 .

It is not a de Polignac number, because 166403056642533 - 2¹³ = 166403056634341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166403056642533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166403056642033) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2484410010 + ... + 2484476987.

It is an arithmetic number, because the mean of its divisors is an integer number (13575827426369).

Almost surely, 2^{166403056642533} is an apocalyptic number.

It is an amenable number.

166403056642533 is a deficient number, since it is larger than the sum of its proper divisors (77961837032109).

166403056642533 is an equidigital number, since it uses as much as digits as its factorization.

166403056642533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4968887125 (or 4968887061 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 54.

The spelling of 166403056642533 in words is "one hundred sixty-six trillion, four hundred three billion, fifty-six million, six hundred forty-two thousand, five hundred thirty-three".