646761963 has 8 divisors (see below), whose sum is σ = 865958400. Its totient is φ = 429370088.

The previous prime is 646761917. The next prime is 646761967. The reversal of 646761963 is 369167646.

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 646761963 - 2⁸ = 646761707 is a prime.

It is a super-2 number, since 2×646761963² = 836602073567226738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646761967) 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, 450303 + ... + 451736.

It is an arithmetic number, because the mean of its divisors is an integer number (108244800).

Almost surely, 2^646761963 is an apocalyptic number.

646761963 is a deficient number, since it is larger than the sum of its proper divisors (219196437).

646761963 is a wasteful number, since it uses less digits than its factorization.

646761963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902281.

The product of its digits is 979776, while the sum is 48.

The square root of 646761963 is about 25431.5151534469. The cubic root of 646761963 is about 864.7982925940.

The spelling of 646761963 in words is "six hundred forty-six million, seven hundred sixty-one thousand, nine hundred sixty-three".