64666788037 has 2 divisors, whose sum is σ = 64666788038. Its totient is φ = 64666788036.

The previous prime is 64666788007. The next prime is 64666788071. The reversal of 64666788037 is 73088766646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39330425761 + 25336362276 = 198319^2 + 159174^2 .

It is a cyclic number.

It is not a de Polignac number, because 64666788037 - 2⁷ = 64666787909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64666788007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32333394018 + 32333394019.

It is an arithmetic number, because the mean of its divisors is an integer number (32333394019).

Almost surely, 2^64666788037 is an apocalyptic number.

It is an amenable number.

64666788037 is a deficient number, since it is larger than the sum of its proper divisors (1).

64666788037 is an equidigital number, since it uses as much as digits as its factorization.

64666788037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48771072, while the sum is 61.

The spelling of 64666788037 in words is "sixty-four billion, six hundred sixty-six million, seven hundred eighty-eight thousand, thirty-seven".