66645378076 has 6 divisors (see below), whose sum is σ = 116629411640. Its totient is φ = 33322689036.

The previous prime is 66645378053. The next prime is 66645378089. The reversal of 66645378076 is 67087354666.

It is a happy number.

66645378076 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66645378076.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330672256 + ... + 8330672263.

Almost surely, 2^66645378076 is an apocalyptic number.

It is an amenable number.

66645378076 is a deficient number, since it is larger than the sum of its proper divisors (49984033564).

66645378076 is a wasteful number, since it uses less digits than its factorization.

66645378076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16661344523 (or 16661344521 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 58.

The spelling of 66645378076 in words is "sixty-six billion, six hundred forty-five million, three hundred seventy-eight thousand, seventy-six".