67781593609 has 2 divisors, whose sum is σ = 67781593610. Its totient is φ = 67781593608.

The previous prime is 67781593603. The next prime is 67781593619. The reversal of 67781593609 is 90639518776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49652317584 + 18129276025 = 222828^2 + 134645^2 .

It is a cyclic number.

It is not a de Polignac number, because 67781593609 - 2³³ = 59191659017 is a prime.

It is not a weakly prime, because it can be changed into another prime (67781593603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33890796804 + 33890796805.

It is an arithmetic number, because the mean of its divisors is an integer number (33890796805).

Almost surely, 2^67781593609 is an apocalyptic number.

It is an amenable number.

67781593609 is a deficient number, since it is larger than the sum of its proper divisors (1).

67781593609 is an equidigital number, since it uses as much as digits as its factorization.

67781593609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 67781593609 in words is "sixty-seven billion, seven hundred eighty-one million, five hundred ninety-three thousand, six hundred nine".