66740074728 has 64 divisors (see below), whose sum is σ = 176542017600. Its totient is φ = 20966584320.

The previous prime is 66740074691. The next prime is 66740074759. The reversal of 66740074728 is 82747004766.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291163 + ... + 467178.

It is an arithmetic number, because the mean of its divisors is an integer number (2758469025).

Almost surely, 2^66740074728 is an apocalyptic number.

It is an amenable number.

66740074728 is an abundant number, since it is smaller than the sum of its proper divisors (109801942872).

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

66740074728 is a wasteful number, since it uses less digits than its factorization.

66740074728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758562 (or 758558 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 51.

The spelling of 66740074728 in words is "sixty-six billion, seven hundred forty million, seventy-four thousand, seven hundred twenty-eight".