66612671999 has 2 divisors, whose sum is σ = 66612672000. Its totient is φ = 66612671998.

The previous prime is 66612671987. The next prime is 66612672011. The reversal of 66612671999 is 99917621666.

It is a balanced prime because it is at equal distance from previous prime (66612671987) and next prime (66612672011).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66612671999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66612671929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33306335999 + 33306336000.

It is an arithmetic number, because the mean of its divisors is an integer number (33306336000).

Almost surely, 2^66612671999 is an apocalyptic number.

66612671999 is a deficient number, since it is larger than the sum of its proper divisors (1).

66612671999 is an equidigital number, since it uses as much as digits as its factorization.

66612671999 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 66612671999 in words is "sixty-six billion, six hundred twelve million, six hundred seventy-one thousand, nine hundred ninety-nine".