643313707 has 2 divisors, whose sum is σ = 643313708. Its totient is φ = 643313706.

The previous prime is 643313689. The next prime is 643313719. The reversal of 643313707 is 707313346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643313707 - 2⁷ = 643313579 is a prime.

It is a super-2 number, since 2×643313707² = 827705051228163698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (643313207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321656853 + 321656854.

It is an arithmetic number, because the mean of its divisors is an integer number (321656854).

Almost surely, 2^643313707 is an apocalyptic number.

643313707 is a deficient number, since it is larger than the sum of its proper divisors (1).

643313707 is an equidigital number, since it uses as much as digits as its factorization.

643313707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 34.

The square root of 643313707 is about 25363.6296101327. The cubic root of 643313707 is about 863.2586425183.

The spelling of 643313707 in words is "six hundred forty-three million, three hundred thirteen thousand, seven hundred seven".