646065969 has 4 divisors (see below), whose sum is σ = 861421296. Its totient is φ = 430710644.

The previous prime is 646065961. The next prime is 646065997. The reversal of 646065969 is 969560646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646065969 - 2³ = 646065961 is a prime.

It is a super-2 number, since 2×646065969² = 834802472599817922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646065961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107677659 + ... + 107677664.

It is an arithmetic number, because the mean of its divisors is an integer number (215355324).

Almost surely, 2^646065969 is an apocalyptic number.

It is an amenable number.

646065969 is a deficient number, since it is larger than the sum of its proper divisors (215355327).

646065969 is a wasteful number, since it uses less digits than its factorization.

646065969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215355326.

The product of its (nonzero) digits is 2099520, while the sum is 51.

The square root of 646065969 is about 25417.8277789429. The cubic root of 646065969 is about 864.4879721102.

The spelling of 646065969 in words is "six hundred forty-six million, sixty-five thousand, nine hundred sixty-nine".