66678573331 has 2 divisors, whose sum is σ = 66678573332. Its totient is φ = 66678573330.

The previous prime is 66678573319. The next prime is 66678573389. The reversal of 66678573331 is 13337587666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66678573331 - 2³³ = 58088638739 is a prime.

It is a super-2 number, since 2×66678573331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66678571331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33339286665 + 33339286666.

It is an arithmetic number, because the mean of its divisors is an integer number (33339286666).

Almost surely, 2^66678573331 is an apocalyptic number.

66678573331 is a deficient number, since it is larger than the sum of its proper divisors (1).

66678573331 is an equidigital number, since it uses as much as digits as its factorization.

66678573331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 55.

The spelling of 66678573331 in words is "sixty-six billion, six hundred seventy-eight million, five hundred seventy-three thousand, three hundred thirty-one".