643011326351 has 2 divisors, whose sum is σ = 643011326352. Its totient is φ = 643011326350.

The previous prime is 643011326329. The next prime is 643011326371. The reversal of 643011326351 is 153623110346.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643011326351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643011326371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321505663175 + 321505663176.

It is an arithmetic number, because the mean of its divisors is an integer number (321505663176).

Almost surely, 2^643011326351 is an apocalyptic number.

643011326351 is a deficient number, since it is larger than the sum of its proper divisors (1).

643011326351 is an equidigital number, since it uses as much as digits as its factorization.

643011326351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 643011326351 its reverse (153623110346), we get a palindrome (796634436697).

The spelling of 643011326351 in words is "six hundred forty-three billion, eleven million, three hundred twenty-six thousand, three hundred fifty-one".