66728470001 has 2 divisors, whose sum is σ = 66728470002. Its totient is φ = 66728470000.

The previous prime is 66728469991. The next prime is 66728470049. The reversal of 66728470001 is 10007482766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66646585600 + 81884401 = 258160^2 + 9049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66728470001 is a prime.

It is not a weakly prime, because it can be changed into another prime (66728470201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33364235000 + 33364235001.

It is an arithmetic number, because the mean of its divisors is an integer number (33364235001).

Almost surely, 2^66728470001 is an apocalyptic number.

It is an amenable number.

66728470001 is a deficient number, since it is larger than the sum of its proper divisors (1).

66728470001 is an equidigital number, since it uses as much as digits as its factorization.

66728470001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 66728470001 in words is "sixty-six billion, seven hundred twenty-eight million, four hundred seventy thousand, one".