166389672077077 has 2 divisors, whose sum is σ = 166389672077078. Its totient is φ = 166389672077076.

The previous prime is 166389672077059. The next prime is 166389672077099. The reversal of 166389672077077 is 770770276983661.

166389672077077 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., 114092968207761 + 52296703869316 = 10681431^2 + 7231646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166389672077077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166389672076994 and 166389672077012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166389672072077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83194836038538 + 83194836038539.

It is an arithmetic number, because the mean of its divisors is an integer number (83194836038539).

Almost surely, 2^{166389672077077} is an apocalyptic number.

It is an amenable number.

166389672077077 is a deficient number, since it is larger than the sum of its proper divisors (1).

166389672077077 is an equidigital number, since it uses as much as digits as its factorization.

166389672077077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568294784, while the sum is 76.

The spelling of 166389672077077 in words is "one hundred sixty-six trillion, three hundred eighty-nine billion, six hundred seventy-two million, seventy-seven thousand, seventy-seven".