643116367 has 4 divisors (see below), whose sum is σ = 652174416. Its totient is φ = 634058320.

The previous prime is 643116347. The next prime is 643116371. The reversal of 643116367 is 763611346.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643116367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643116347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4528918 + ... + 4529059.

It is an arithmetic number, because the mean of its divisors is an integer number (163043604).

Almost surely, 2^643116367 is an apocalyptic number.

643116367 is a deficient number, since it is larger than the sum of its proper divisors (9058049).

643116367 is an equidigital number, since it uses as much as digits as its factorization.

643116367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9058048.

The product of its digits is 54432, while the sum is 37.

The square root of 643116367 is about 25359.7390956611. The cubic root of 643116367 is about 863.1703637201.

The spelling of 643116367 in words is "six hundred forty-three million, one hundred sixteen thousand, three hundred sixty-seven".