66918194396 has 6 divisors (see below), whose sum is σ = 117106840200. Its totient is φ = 33459097196.

The previous prime is 66918194381. The next prime is 66918194411. The reversal of 66918194396 is 69349181966.

It is an interprime number because it is at equal distance from previous prime (66918194381) and next prime (66918194411).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8364774296 + ... + 8364774303.

It is an arithmetic number, because the mean of its divisors is an integer number (19517806700).

Almost surely, 2^66918194396 is an apocalyptic number.

It is an amenable number.

66918194396 is a deficient number, since it is larger than the sum of its proper divisors (50188645804).

66918194396 is a wasteful number, since it uses less digits than its factorization.

66918194396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16729548603 (or 16729548601 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 62.

The spelling of 66918194396 in words is "sixty-six billion, nine hundred eighteen million, one hundred ninety-four thousand, three hundred ninety-six".