646965243 has 12 divisors (see below), whose sum is σ = 989476488. Its totient is φ = 405938880.

The previous prime is 646965217. The next prime is 646965247. The reversal of 646965243 is 342569646.

646965243 is a `hidden beast` number, since 64 + 69 + 6 + 524 + 3 = 666.

It is not a de Polignac number, because 646965243 - 2⁵ = 646965211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646965247) 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, 2114113 + ... + 2114418.

It is an arithmetic number, because the mean of its divisors is an integer number (82456374).

Almost surely, 2^646965243 is an apocalyptic number.

646965243 is a deficient number, since it is larger than the sum of its proper divisors (342511245).

646965243 is a wasteful number, since it uses less digits than its factorization.

646965243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228554 (or 4228551 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 646965243 is about 25435.5114554435. The cubic root of 646965243 is about 864.8888863479. Note that the first 5 decimals are identical.

The spelling of 646965243 in words is "six hundred forty-six million, nine hundred sixty-five thousand, two hundred forty-three".