166161066125 has 16 divisors (see below), whose sum is σ = 212973584304. Its totient is φ = 129336177600.

The previous prime is 166161066091. The next prime is 166161066157. The reversal of 166161066125 is 521660161661.

It can be written as a sum of positive squares in 8 ways, for example, as 2804443849 + 163356622276 = 52957^2 + 404174^2 .

It is not a de Polignac number, because 166161066125 - 2¹⁶ = 166161000589 is a prime.

It is a Duffinian number.

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, 17958734 + ... + 17967983.

It is an arithmetic number, because the mean of its divisors is an integer number (13310849019).

Almost surely, 2^166161066125 is an apocalyptic number.

It is an amenable number.

166161066125 is a deficient number, since it is larger than the sum of its proper divisors (46812518179).

166161066125 is an equidigital number, since it uses as much as digits as its factorization.

166161066125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35926769 (or 35926759 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 166161066125 in words is "one hundred sixty-six billion, one hundred sixty-one million, sixty-six thousand, one hundred twenty-five".