66478699687466 has 16 divisors (see below), whose sum is σ = 108978628983840. Its totient is φ = 30163340149680.

The previous prime is 66478699687459. The next prime is 66478699687493.

66478699687466 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×66478699687466³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2712518336 + ... + 2712542843.

It is an arithmetic number, because the mean of its divisors is an integer number (6811164311490).

Almost surely, 2^{66478699687466} is an apocalyptic number.

66478699687466 is a deficient number, since it is larger than the sum of its proper divisors (42499929296374).

66478699687466 is a wasteful number, since it uses less digits than its factorization.

66478699687466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5425061749.

The product of its digits is 189621927936, while the sum is 92.

The spelling of 66478699687466 in words is "sixty-six trillion, four hundred seventy-eight billion, six hundred ninety-nine million, six hundred eighty-seven thousand, four hundred sixty-six".