66668939288 has 32 divisors (see below), whose sum is σ = 146723152800. Its totient is φ = 27800174592.

The previous prime is 66668939263. The next prime is 66668939297. The reversal of 66668939288 is 88293986666.

It is a congruent number.

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, 16085993 + ... + 16090136.

It is an arithmetic number, because the mean of its divisors is an integer number (4585098525).

Almost surely, 2^66668939288 is an apocalyptic number.

It is an amenable number.

66668939288 is an abundant number, since it is smaller than the sum of its proper divisors (80054213512).

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

66668939288 is a wasteful number, since it uses less digits than its factorization.

66668939288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32176179 (or 32176175 counting only the distinct ones).

The product of its digits is 322486272, while the sum is 71.

The spelling of 66668939288 in words is "sixty-six billion, six hundred sixty-eight million, nine hundred thirty-nine thousand, two hundred eighty-eight".