66212737609 has 2 divisors, whose sum is σ = 66212737610. Its totient is φ = 66212737608.

The previous prime is 66212737603. The next prime is 66212737667. The reversal of 66212737609 is 90673721266.

66212737609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64110240000 + 2102497609 = 253200^2 + 45853^2 .

It is a cyclic number.

It is not a de Polignac number, because 66212737609 - 2¹⁹ = 66212213321 is a prime.

It is not a weakly prime, because it can be changed into another prime (66212737603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33106368804 + 33106368805.

It is an arithmetic number, because the mean of its divisors is an integer number (33106368805).

Almost surely, 2^66212737609 is an apocalyptic number.

It is an amenable number.

66212737609 is a deficient number, since it is larger than the sum of its proper divisors (1).

66212737609 is an equidigital number, since it uses as much as digits as its factorization.

66212737609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 49.

The spelling of 66212737609 in words is "sixty-six billion, two hundred twelve million, seven hundred thirty-seven thousand, six hundred nine".