66986436578 has 8 divisors (see below), whose sum is σ = 100487739072. Its totient is φ = 33490523556.

The previous prime is 66986436563. The next prime is 66986436611. The reversal of 66986436578 is 87563468966.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1316150 + ... + 1366097.

It is an arithmetic number, because the mean of its divisors is an integer number (12560967384).

Almost surely, 2^66986436578 is an apocalyptic number.

66986436578 is a deficient number, since it is larger than the sum of its proper divisors (33501302494).

66986436578 is a wasteful number, since it uses less digits than its factorization.

66986436578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694736.

The product of its digits is 313528320, while the sum is 68.

The spelling of 66986436578 in words is "sixty-six billion, nine hundred eighty-six million, four hundred thirty-six thousand, five hundred seventy-eight".