66728045363 has 32 divisors (see below), whose sum is σ = 82163455488. Its totient is φ = 52888435200.

The previous prime is 66728045359. The next prime is 66728045393. The reversal of 66728045363 is 36354082766.

It is a cyclic number.

It is not a de Polignac number, because 66728045363 - 2² = 66728045359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66728045323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7043756 + ... + 7053222.

It is an arithmetic number, because the mean of its divisors is an integer number (2567607984).

Almost surely, 2^66728045363 is an apocalyptic number.

66728045363 is a deficient number, since it is larger than the sum of its proper divisors (15435410125).

66728045363 is a wasteful number, since it uses less digits than its factorization.

66728045363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10523.

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 66728045363 in words is "sixty-six billion, seven hundred twenty-eight million, forty-five thousand, three hundred sixty-three".