166018613749 has 2 divisors, whose sum is σ = 166018613750. Its totient is φ = 166018613748.

The previous prime is 166018613711. The next prime is 166018613767. The reversal of 166018613749 is 947316810661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154095502500 + 11923111249 = 392550^2 + 109193^2 .

It is a cyclic number.

It is not a de Polignac number, because 166018613749 - 2⁹ = 166018613237 is a prime.

It is a super-2 number, since 2×166018613749² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166018613696 and 166018613705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166018617749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83009306874 + 83009306875.

It is an arithmetic number, because the mean of its divisors is an integer number (83009306875).

Almost surely, 2^166018613749 is an apocalyptic number.

It is an amenable number.

166018613749 is a deficient number, since it is larger than the sum of its proper divisors (1).

166018613749 is an equidigital number, since it uses as much as digits as its factorization.

166018613749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 166018613749 in words is "one hundred sixty-six billion, eighteen million, six hundred thirteen thousand, seven hundred forty-nine".