665283787 has 4 divisors (see below), whose sum is σ = 760324336. Its totient is φ = 570243240.

The previous prime is 665283739. The next prime is 665283793. The reversal of 665283787 is 787382566.

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

It is not a de Polignac number, because 665283787 - 2²³ = 656895179 is a prime.

It is a super-2 number, since 2×665283787² = 885205034490122738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665283187) 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, 47520264 + ... + 47520277.

It is an arithmetic number, because the mean of its divisors is an integer number (190081084).

Almost surely, 2^665283787 is an apocalyptic number.

665283787 is a deficient number, since it is larger than the sum of its proper divisors (95040549).

665283787 is an equidigital number, since it uses as much as digits as its factorization.

665283787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95040548.

The product of its digits is 3386880, while the sum is 52.

The square root of 665283787 is about 25793.0957234683. The cubic root of 665283787 is about 872.9760182741.

The spelling of 665283787 in words is "six hundred sixty-five million, two hundred eighty-three thousand, seven hundred eighty-seven".