646333963 has 24 divisors (see below), whose sum is σ = 766175760. Its totient is φ = 542995200.

The previous prime is 646333927. The next prime is 646333969. The reversal of 646333963 is 369333646.

It is a de Polignac number, because none of the positive numbers 2^k-646333963 is a prime.

It is a super-3 number, since 3×646333963³ (a number of 27 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (646333969) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90831 + ... + 97687.

It is an arithmetic number, because the mean of its divisors is an integer number (31923990).

Almost surely, 2^646333963 is an apocalyptic number.

646333963 is a deficient number, since it is larger than the sum of its proper divisors (119841797).

646333963 is a wasteful number, since it uses less digits than its factorization.

646333963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6939 (or 6928 counting only the distinct ones).

The product of its digits is 629856, while the sum is 43.

The square root of 646333963 is about 25423.0990046454. The cubic root of 646333963 is about 864.6074880596.

The spelling of 646333963 in words is "six hundred forty-six million, three hundred thirty-three thousand, nine hundred sixty-three".