166520563061245 has 16 divisors (see below), whose sum is σ = 200434843775088. Its totient is φ = 132809739632640.

The previous prime is 166520563061231. The next prime is 166520563061297. The reversal of 166520563061245 is 542160365025661.

It can be written as a sum of positive squares in 8 ways, for example, as 690325016164 + 165830238045081 = 830858^2 + 12877509^2 .

It is not a de Polignac number, because 166520563061245 - 2⁴⁷ = 25783074705917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166520563061192 and 166520563061201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15403165 + ... + 23880925.

It is an arithmetic number, because the mean of its divisors is an integer number (12527177735943).

Almost surely, 2^{166520563061245} is an apocalyptic number.

It is an amenable number.

166520563061245 is a deficient number, since it is larger than the sum of its proper divisors (33914280713843).

166520563061245 is a wasteful number, since it uses less digits than its factorization.

166520563061245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8489760.

The product of its (nonzero) digits is 7776000, while the sum is 52.

The spelling of 166520563061245 in words is "one hundred sixty-six trillion, five hundred twenty billion, five hundred sixty-three million, sixty-one thousand, two hundred forty-five".