67646081543 has 4 divisors (see below), whose sum is σ = 67859476440. Its totient is φ = 67432686648.

The previous prime is 67646081521. The next prime is 67646081597. The reversal of 67646081543 is 34518064676.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67646081543 - 2⁶ = 67646081479 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67646081491 and 67646081500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67646081143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106696973 + ... + 106697606.

It is an arithmetic number, because the mean of its divisors is an integer number (16964869110).

Almost surely, 2^67646081543 is an apocalyptic number.

67646081543 is a deficient number, since it is larger than the sum of its proper divisors (213394897).

67646081543 is a wasteful number, since it uses less digits than its factorization.

67646081543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213394896.

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 67646081543 in words is "sixty-seven billion, six hundred forty-six million, eighty-one thousand, five hundred forty-three".