667779911 has 8 divisors (see below), whose sum is σ = 671364144. Its totient is φ = 664202880.

The previous prime is 667779899. The next prime is 667779929. The reversal of 667779911 is 119977766.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 667779911 - 2¹⁴ = 667763527 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667779311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349220 + ... + 351126.

It is an arithmetic number, because the mean of its divisors is an integer number (83920518).

Almost surely, 2^667779911 is an apocalyptic number.

667779911 is a deficient number, since it is larger than the sum of its proper divisors (3584233).

667779911 is a wasteful number, since it uses less digits than its factorization.

667779911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601.

The product of its digits is 1000188, while the sum is 53.

The square root of 667779911 is about 25841.4378663417. The cubic root of 667779911 is about 874.0664485783.

The spelling of 667779911 in words is "six hundred sixty-seven million, seven hundred seventy-nine thousand, nine hundred eleven".