665231777 has 8 divisors (see below), whose sum is σ = 804986496. Its totient is φ = 536657472.

The previous prime is 665231771. The next prime is 665231797. The reversal of 665231777 is 777132566.

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 665231777 - 2⁴ = 665231761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665231771) 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, 2794973 + ... + 2795210.

It is an arithmetic number, because the mean of its divisors is an integer number (100623312).

Almost surely, 2^665231777 is an apocalyptic number.

It is an amenable number.

665231777 is a deficient number, since it is larger than the sum of its proper divisors (139754719).

665231777 is a wasteful number, since it uses less digits than its factorization.

665231777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5590207.

The product of its digits is 370440, while the sum is 44.

The square root of 665231777 is about 25792.0874882201. The cubic root of 665231777 is about 872.9532687514.

The spelling of 665231777 in words is "six hundred sixty-five million, two hundred thirty-one thousand, seven hundred seventy-seven".