667986473305 has 8 divisors (see below), whose sum is σ = 804909843144. Its totient is φ = 532171795200.

The previous prime is 667986473293. The next prime is 667986473311. The reversal of 667986473305 is 503374689766.

It can be written as a sum of positive squares in 4 ways, for example, as 175916491776 + 492069981529 = 419424^2 + 701477^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667986473305 - 2⁷ = 667986473177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 277171606 + ... + 277174015.

It is an arithmetic number, because the mean of its divisors is an integer number (100613730393).

Almost surely, 2^667986473305 is an apocalyptic number.

It is an amenable number.

667986473305 is a deficient number, since it is larger than the sum of its proper divisors (136923369839).

667986473305 is a wasteful number, since it uses less digits than its factorization.

667986473305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554345867.

The product of its (nonzero) digits is 137168640, while the sum is 64.

The spelling of 667986473305 in words is "six hundred sixty-seven billion, nine hundred eighty-six million, four hundred seventy-three thousand, three hundred five".