641935667 has 2 divisors, whose sum is σ = 641935668. Its totient is φ = 641935666.

The previous prime is 641935663. The next prime is 641935669. The reversal of 641935667 is 766539146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641935667 - 2² = 641935663 is a prime.

Together with 641935669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641935661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320967833 + 320967834.

It is an arithmetic number, because the mean of its divisors is an integer number (320967834).

Almost surely, 2^641935667 is an apocalyptic number.

641935667 is a deficient number, since it is larger than the sum of its proper divisors (1).

641935667 is an equidigital number, since it uses as much as digits as its factorization.

641935667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 47.

The square root of 641935667 is about 25336.4493763432. The cubic root of 641935667 is about 862.6418074474.

The spelling of 641935667 in words is "six hundred forty-one million, nine hundred thirty-five thousand, six hundred sixty-seven".