66700398619 has 2 divisors, whose sum is σ = 66700398620. Its totient is φ = 66700398618.

The previous prime is 66700398617. The next prime is 66700398647. The reversal of 66700398619 is 91689300766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66700398619 - 2¹ = 66700398617 is a prime.

It is a super-2 number, since 2×66700398619² (a number of 22 digits) contains 22 as substring.

Together with 66700398617, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66700398619.

It is not a weakly prime, because it can be changed into another prime (66700398617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33350199309 + 33350199310.

It is an arithmetic number, because the mean of its divisors is an integer number (33350199310).

Almost surely, 2^66700398619 is an apocalyptic number.

66700398619 is a deficient number, since it is larger than the sum of its proper divisors (1).

66700398619 is an equidigital number, since it uses as much as digits as its factorization.

66700398619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 66700398619 in words is "sixty-six billion, seven hundred million, three hundred ninety-eight thousand, six hundred nineteen".