665000019 has 12 divisors (see below), whose sum is σ = 1011111400. Its totient is φ = 419999904.

The previous prime is 664999949. The next prime is 665000027. The reversal of 665000019 is 910000566.

665000019 is a `hidden beast` number, since 6 + 650 + 0 + 0 + 0 + 1 + 9 = 666.

It is not a de Polignac number, because 665000019 - 2⁷ = 664999891 is a prime.

It is a super-2 number, since 2×665000019² = 884450050540000722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664999956 and 665000001.

It is not an unprimeable number, because it can be changed into a prime (665000029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1944274 + ... + 1944615.

Almost surely, 2^665000019 is an apocalyptic number.

665000019 is a deficient number, since it is larger than the sum of its proper divisors (346111381).

665000019 is a wasteful number, since it uses less digits than its factorization.

665000019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888914 (or 3888911 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 665000019 is about 25787.5942848494. The cubic root of 665000019 is about 872.8518818315.

The spelling of 665000019 in words is "six hundred sixty-five million, nineteen", and thus it is an aban number.