664111367 has 4 divisors (see below), whose sum is σ = 672517920. Its totient is φ = 655704816.

The previous prime is 664111333. The next prime is 664111391. The reversal of 664111367 is 763111466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664111367 - 2¹⁶ = 664045831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664911367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4203158 + ... + 4203315.

It is an arithmetic number, because the mean of its divisors is an integer number (168129480).

Almost surely, 2^664111367 is an apocalyptic number.

664111367 is a deficient number, since it is larger than the sum of its proper divisors (8406553).

664111367 is an equidigital number, since it uses as much as digits as its factorization.

664111367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8406552.

The product of its digits is 18144, while the sum is 35.

The square root of 664111367 is about 25770.3583017388. The cubic root of 664111367 is about 872.4629057335.

Subtracting 664111367 from its reverse (763111466), we obtain a palindrome (99000099).

The spelling of 664111367 in words is "six hundred sixty-four million, one hundred eleven thousand, three hundred sixty-seven".