67781079845 has 32 divisors (see below), whose sum is σ = 88214330880. Its totient is φ = 49832616960.

The previous prime is 67781079841. The next prime is 67781079859. The reversal of 67781079845 is 54897018776.

It is not a de Polignac number, because 67781079845 - 2² = 67781079841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67781079841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 437375 + ... + 571715.

It is an arithmetic number, because the mean of its divisors is an integer number (2756697840).

Almost surely, 2^67781079845 is an apocalyptic number.

It is an amenable number.

67781079845 is a deficient number, since it is larger than the sum of its proper divisors (20433251035).

67781079845 is a wasteful number, since it uses less digits than its factorization.

67781079845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134525.

The product of its (nonzero) digits is 23708160, while the sum is 62.

The spelling of 67781079845 in words is "sixty-seven billion, seven hundred eighty-one million, seventy-nine thousand, eight hundred forty-five".