66178674616 has 16 divisors (see below), whose sum is σ = 124121658240. Its totient is φ = 33079565760.

The previous prime is 66178674581. The next prime is 66178674631. The reversal of 66178674616 is 61647687166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192621 + ... + 1246876.

It is an arithmetic number, because the mean of its divisors is an integer number (7757603640).

Almost surely, 2^66178674616 is an apocalyptic number.

It is an amenable number.

66178674616 is a deficient number, since it is larger than the sum of its proper divisors (57942983624).

66178674616 is a wasteful number, since it uses less digits than its factorization.

66178674616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442894 (or 2442890 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 58.

The spelling of 66178674616 in words is "sixty-six billion, one hundred seventy-eight million, six hundred seventy-four thousand, six hundred sixteen".