66659418428 has 12 divisors (see below), whose sum is σ = 118855001160. Its totient is φ = 32700846672.

The previous prime is 66659418421. The next prime is 66659418439. The reversal of 66659418428 is 82481495666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66659418421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157215398 + ... + 157215821.

It is an arithmetic number, because the mean of its divisors is an integer number (9904583430).

Almost surely, 2^66659418428 is an apocalyptic number.

It is an amenable number.

66659418428 is a deficient number, since it is larger than the sum of its proper divisors (52195582732).

66659418428 is a wasteful number, since it uses less digits than its factorization.

66659418428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314431276 (or 314431274 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 59.

The spelling of 66659418428 in words is "sixty-six billion, six hundred fifty-nine million, four hundred eighteen thousand, four hundred twenty-eight".