66616520166170 has 16 divisors (see below), whose sum is σ = 129133562168520. Its totient is φ = 24596868984384.

The previous prime is 66616520166167. The next prime is 66616520166179. The reversal of 66616520166170 is 7166102561666.

It can be written as a sum of positive squares in 4 ways, for example, as 43579102493809 + 23037417672361 = 6601447^2 + 4799731^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66616520166179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256217385125 + ... + 256217385384.

Almost surely, 2^{66616520166170} is an apocalyptic number.

66616520166170 is a deficient number, since it is larger than the sum of its proper divisors (62517042002350).

66616520166170 is a wasteful number, since it uses less digits than its factorization.

66616520166170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512434770529.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 66616520166170 in words is "sixty-six trillion, six hundred sixteen billion, five hundred twenty million, one hundred sixty-six thousand, one hundred seventy".