67531664809 has 6 divisors (see below), whose sum is σ = 78557242794. Its totient is φ = 57884284080.

The previous prime is 67531664801. The next prime is 67531664821. The reversal of 67531664809 is 90846613576.

It can be written as a sum of positive squares in only one way, i.e., 66051570025 + 1480094784 = 257005^2 + 38472^2 .

It is not a de Polignac number, because 67531664809 - 2³ = 67531664801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67531664809.

It is not an unprimeable number, because it can be changed into a prime (67531664801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 689098572 + ... + 689098669.

It is an arithmetic number, because the mean of its divisors is an integer number (13092873799).

Almost surely, 2^67531664809 is an apocalyptic number.

It is an amenable number.

67531664809 is a deficient number, since it is larger than the sum of its proper divisors (11025577985).

67531664809 is a wasteful number, since it uses less digits than its factorization.

67531664809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378197255 (or 1378197248 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 67531664809 in words is "sixty-seven billion, five hundred thirty-one million, six hundred sixty-four thousand, eight hundred nine".