66698026688 has 28 divisors (see below), whose sum is σ = 136623381312. Its totient is φ = 32273237760.

The previous prime is 66698026667. The next prime is 66698026693. The reversal of 66698026688 is 88662089666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16806995 + ... + 16810962.

Almost surely, 2^66698026688 is an apocalyptic number.

It is an amenable number.

66698026688 is an abundant number, since it is smaller than the sum of its proper divisors (69925354624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66698026688 is a wasteful number, since it uses less digits than its factorization.

66698026688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33618000 (or 33617990 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 65.

The spelling of 66698026688 in words is "sixty-six billion, six hundred ninety-eight million, twenty-six thousand, six hundred eighty-eight".