66194705122506 has 16 divisors (see below), whose sum is σ = 147099344716800. Its totient is φ = 22064901707484.

The previous prime is 66194705122501. The next prime is 66194705122529. The reversal of 66194705122506 is 60522150749166.

66194705122506 is a `hidden beast` number, since 6 + 6 + 1 + 9 + 4 + 7 + 0 + 5 + 122 + 506 = 666.

It is a super-4 number, since 4×66194705122506⁴ (a number of 56 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1225827872639 = 66194705122506 / (6 + 6 + 1 + 9 + 4 + 7 + 0 + 5 + 1 + 2 + 2 + 5 + 0 + 6).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66194705122501) 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, 612913936266 + ... + 612913936373.

It is an arithmetic number, because the mean of its divisors is an integer number (9193709044800).

Almost surely, 2^{66194705122506} is an apocalyptic number.

66194705122506 is an abundant number, since it is smaller than the sum of its proper divisors (80904639594294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66194705122506 is a wasteful number, since it uses less digits than its factorization.

66194705122506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225827872650 (or 1225827872644 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 66194705122506 in words is "sixty-six trillion, one hundred ninety-four billion, seven hundred five million, one hundred twenty-two thousand, five hundred six".