664111277 has 4 divisors (see below), whose sum is σ = 665059356. Its totient is φ = 663163200.

The previous prime is 664111271. The next prime is 664111291. The reversal of 664111277 is 772111466.

It is a happy number.

664111277 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 387853636 + 276257641 = 19694^2 + 16621^2 .

It is a cyclic number.

It is not a de Polignac number, because 664111277 - 2¹² = 664107181 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 (664111271) 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, 472988 + ... + 474389.

It is an arithmetic number, because the mean of its divisors is an integer number (166264839).

Almost surely, 2^664111277 is an apocalyptic number.

It is an amenable number.

664111277 is a deficient number, since it is larger than the sum of its proper divisors (948079).

664111277 is an equidigital number, since it uses as much as digits as its factorization.

664111277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948078.

The product of its digits is 14112, while the sum is 35.

The square root of 664111277 is about 25770.3565555465. The cubic root of 664111277 is about 872.4628663216.

The spelling of 664111277 in words is "six hundred sixty-four million, one hundred eleven thousand, two hundred seventy-seven".