66565166156566 has 64 divisors (see below), whose sum is σ = 131306447646720. Its totient is φ = 24519056412960.

The previous prime is 66565166156557. The next prime is 66565166156569.

66565166156566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66565166156495 and 66565166156504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66565166156569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21931860 + ... + 24781783.

It is an arithmetic number, because the mean of its divisors is an integer number (2051663244480).

Almost surely, 2^{66565166156566} is an apocalyptic number.

66565166156566 is a deficient number, since it is larger than the sum of its proper divisors (64741281490154).

66565166156566 is a wasteful number, since it uses less digits than its factorization.

66565166156566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46714169.

The product of its digits is 1049760000, while the sum is 70.

The spelling of 66565166156566 in words is "sixty-six trillion, five hundred sixty-five billion, one hundred sixty-six million, one hundred fifty-six thousand, five hundred sixty-six".