646663127 has 8 divisors (see below), whose sum is σ = 715115280. Its totient is φ = 579821760.

The previous prime is 646663117. The next prime is 646663133. The reversal of 646663127 is 721366646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646663127 - 2²² = 642468823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646663117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401852 + ... + 403457.

It is an arithmetic number, because the mean of its divisors is an integer number (89389410).

Almost surely, 2^646663127 is an apocalyptic number.

646663127 is a deficient number, since it is larger than the sum of its proper divisors (68452153).

646663127 is a wasteful number, since it uses less digits than its factorization.

646663127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805393.

The product of its digits is 217728, while the sum is 41.

The square root of 646663127 is about 25429.5718996604. The cubic root of 646663127 is about 864.7542384889.

The spelling of 646663127 in words is "six hundred forty-six million, six hundred sixty-three thousand, one hundred twenty-seven".