643147720207 has 2 divisors, whose sum is σ = 643147720208. Its totient is φ = 643147720206.

The previous prime is 643147720183. The next prime is 643147720219. The reversal of 643147720207 is 702027741346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643147720207 - 2²⁷ = 643013502479 is a prime.

It is a super-2 number, since 2×643147720207² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643147720277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321573860103 + 321573860104.

It is an arithmetic number, because the mean of its divisors is an integer number (321573860104).

Almost surely, 2^643147720207 is an apocalyptic number.

643147720207 is a deficient number, since it is larger than the sum of its proper divisors (1).

643147720207 is an equidigital number, since it uses as much as digits as its factorization.

643147720207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 43.

The spelling of 643147720207 in words is "six hundred forty-three billion, one hundred forty-seven million, seven hundred twenty thousand, two hundred seven".