66212299997 has 2 divisors, whose sum is σ = 66212299998. Its totient is φ = 66212299996.

The previous prime is 66212299969. The next prime is 66212300029. The reversal of 66212299997 is 79999221266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60051462916 + 6160837081 = 245054^2 + 78491^2 .

It is a cyclic number.

It is not a de Polignac number, because 66212299997 - 2¹⁰ = 66212298973 is a prime.

It is a super-4 number, since 4×66212299997⁴ (a number of 44 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66212299957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33106149998 + 33106149999.

It is an arithmetic number, because the mean of its divisors is an integer number (33106149999).

Almost surely, 2^66212299997 is an apocalyptic number.

It is an amenable number.

66212299997 is a deficient number, since it is larger than the sum of its proper divisors (1).

66212299997 is an equidigital number, since it uses as much as digits as its factorization.

66212299997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 62.

The spelling of 66212299997 in words is "sixty-six billion, two hundred twelve million, two hundred ninety-nine thousand, nine hundred ninety-seven".