66239788001 has 2 divisors, whose sum is σ = 66239788002. Its totient is φ = 66239788000.

The previous prime is 66239787997. The next prime is 66239788037. The reversal of 66239788001 is 10088793266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64923549601 + 1316238400 = 254801^2 + 36280^2 .

It is a cyclic number.

It is not a de Polignac number, because 66239788001 - 2² = 66239787997 is a prime.

It is not a weakly prime, because it can be changed into another prime (66239788301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33119894000 + 33119894001.

It is an arithmetic number, because the mean of its divisors is an integer number (33119894001).

Almost surely, 2^66239788001 is an apocalyptic number.

It is an amenable number.

66239788001 is a deficient number, since it is larger than the sum of its proper divisors (1).

66239788001 is an equidigital number, since it uses as much as digits as its factorization.

66239788001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 66239788001 in words is "sixty-six billion, two hundred thirty-nine million, seven hundred eighty-eight thousand, one".