66874512178 has 16 divisors (see below), whose sum is σ = 110830394880. Its totient is φ = 30102081856.

The previous prime is 66874512083. The next prime is 66874512191. The reversal of 66874512178 is 87121547866.

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, 42757858 + ... + 42759421.

It is an arithmetic number, because the mean of its divisors is an integer number (6926899680).

Almost surely, 2^66874512178 is an apocalyptic number.

66874512178 is a deficient number, since it is larger than the sum of its proper divisors (43955882702).

66874512178 is a wasteful number, since it uses less digits than its factorization.

66874512178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85517321.

The product of its digits is 4515840, while the sum is 55.

The spelling of 66874512178 in words is "sixty-six billion, eight hundred seventy-four million, five hundred twelve thousand, one hundred seventy-eight".