166018617749 has 2 divisors, whose sum is σ = 166018617750. Its totient is φ = 166018617748.

The previous prime is 166018617727. The next prime is 166018617757. The reversal of 166018617749 is 947716810661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161945880625 + 4072737124 = 402425^2 + 63818^2 .

It is a cyclic number.

It is not a de Polignac number, because 166018617749 - 2¹² = 166018613653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166018617694 and 166018617703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166018613749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83009308874 + 83009308875.

It is an arithmetic number, because the mean of its divisors is an integer number (83009308875).

Almost surely, 2^166018617749 is an apocalyptic number.

It is an amenable number.

166018617749 is a deficient number, since it is larger than the sum of its proper divisors (1).

166018617749 is an equidigital number, since it uses as much as digits as its factorization.

166018617749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 166018617749 in words is "one hundred sixty-six billion, eighteen million, six hundred seventeen thousand, seven hundred forty-nine".