166347438377 has 2 divisors, whose sum is σ = 166347438378. Its totient is φ = 166347438376.

The previous prime is 166347438373. The next prime is 166347438421. The reversal of 166347438377 is 773834743661.

166347438377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109176715561 + 57170722816 = 330419^2 + 239104^2 .

It is a cyclic number.

It is not a de Polignac number, because 166347438377 - 2² = 166347438373 is a prime.

It is not a weakly prime, because it can be changed into another prime (166347438371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83173719188 + 83173719189.

It is an arithmetic number, because the mean of its divisors is an integer number (83173719189).

Almost surely, 2^166347438377 is an apocalyptic number.

It is an amenable number.

166347438377 is a deficient number, since it is larger than the sum of its proper divisors (1).

166347438377 is an equidigital number, since it uses as much as digits as its factorization.

166347438377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42674688, while the sum is 59.

The spelling of 166347438377 in words is "one hundred sixty-six billion, three hundred forty-seven million, four hundred thirty-eight thousand, three hundred seventy-seven".