641557405507 has 2 divisors, whose sum is σ = 641557405508. Its totient is φ = 641557405506.

The previous prime is 641557405441. The next prime is 641557405519. The reversal of 641557405507 is 705504755146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641557405507 - 2¹⁹ = 641556881219 is a prime.

It is not a weakly prime, because it can be changed into another prime (641557405547) 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, 320778702753 + 320778702754.

It is an arithmetic number, because the mean of its divisors is an integer number (320778702754).

Almost surely, 2^641557405507 is an apocalyptic number.

641557405507 is a deficient number, since it is larger than the sum of its proper divisors (1).

641557405507 is an equidigital number, since it uses as much as digits as its factorization.

641557405507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940000, while the sum is 49.

The spelling of 641557405507 in words is "six hundred forty-one billion, five hundred fifty-seven million, four hundred five thousand, five hundred seven".