67546666643 has 2 divisors, whose sum is σ = 67546666644. Its totient is φ = 67546666642.

The previous prime is 67546666609. The next prime is 67546666717. The reversal of 67546666643 is 34666664576.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67546666643 - 2²⁶ = 67479557779 is a prime.

It is a super-3 number, since 3×67546666643³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (67546662643) 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, 33773333321 + 33773333322.

It is an arithmetic number, because the mean of its divisors is an integer number (33773333322).

Almost surely, 2^67546666643 is an apocalyptic number.

67546666643 is a deficient number, since it is larger than the sum of its proper divisors (1).

67546666643 is an equidigital number, since it uses as much as digits as its factorization.

67546666643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 59.

The spelling of 67546666643 in words is "sixty-seven billion, five hundred forty-six million, six hundred sixty-six thousand, six hundred forty-three".