66212737667 has 2 divisors, whose sum is σ = 66212737668. Its totient is φ = 66212737666.

The previous prime is 66212737609. The next prime is 66212737699. The reversal of 66212737667 is 76673721266.

66212737667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66212737667 - 2⁶ = 66212737603 is a prime.

It is a super-4 number, since 4×66212737667⁴ (a number of 44 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (66212737267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33106368833 + 33106368834.

It is an arithmetic number, because the mean of its divisors is an integer number (33106368834).

Almost surely, 2^66212737667 is an apocalyptic number.

66212737667 is a deficient number, since it is larger than the sum of its proper divisors (1).

66212737667 is an equidigital number, since it uses as much as digits as its factorization.

66212737667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 53.

The spelling of 66212737667 in words is "sixty-six billion, two hundred twelve million, seven hundred thirty-seven thousand, six hundred sixty-seven".