665008849 has 2 divisors, whose sum is σ = 665008850. Its totient is φ = 665008848.

The previous prime is 665008843. The next prime is 665008859. The reversal of 665008849 is 948800566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662135824 + 2873025 = 25732^2 + 1695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665008849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665008799 and 665008808.

It is not a weakly prime, because it can be changed into another prime (665008843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332504424 + 332504425.

It is an arithmetic number, because the mean of its divisors is an integer number (332504425).

Almost surely, 2^665008849 is an apocalyptic number.

It is an amenable number.

665008849 is a deficient number, since it is larger than the sum of its proper divisors (1).

665008849 is an equidigital number, since it uses as much as digits as its factorization.

665008849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 665008849 is about 25787.7654906353. The cubic root of 665008849 is about 872.8557451136.

The spelling of 665008849 in words is "six hundred sixty-five million, eight thousand, eight hundred forty-nine".