643076361 has 16 divisors (see below), whose sum is σ = 953579520. Its totient is φ = 428324400.

The previous prime is 643076351. The next prime is 643076407. The reversal of 643076361 is 163670346.

It is a happy number.

643076361 is a `hidden beast` number, since 643 + 0 + 7 + 6 + 3 + 6 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-643076361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643076321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20731 + ... + 41423.

It is an arithmetic number, because the mean of its divisors is an integer number (59598720).

Almost surely, 2^643076361 is an apocalyptic number.

It is an amenable number.

643076361 is a deficient number, since it is larger than the sum of its proper divisors (310503159).

643076361 is a wasteful number, since it uses less digits than its factorization.

643076361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21853 (or 21847 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 643076361 is about 25358.9503134495. The cubic root of 643076361 is about 863.1524650881.

The spelling of 643076361 in words is "six hundred forty-three million, seventy-six thousand, three hundred sixty-one".