641460554809 has 2 divisors, whose sum is σ = 641460554810. Its totient is φ = 641460554808.

The previous prime is 641460554807. The next prime is 641460554849. The reversal of 641460554809 is 908455064146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635961590784 + 5498964025 = 797472^2 + 74155^2 .

It is a cyclic number.

It is not a de Polignac number, because 641460554809 - 2¹ = 641460554807 is a prime.

It is a super-2 number, since 2×641460554809² (a number of 24 digits) contains 22 as substring.

Together with 641460554807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (641460554807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320730277404 + 320730277405.

It is an arithmetic number, because the mean of its divisors is an integer number (320730277405).

Almost surely, 2^641460554809 is an apocalyptic number.

It is an amenable number.

641460554809 is a deficient number, since it is larger than the sum of its proper divisors (1).

641460554809 is an equidigital number, since it uses as much as digits as its factorization.

641460554809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4147200, while the sum is 52.

The spelling of 641460554809 in words is "six hundred forty-one billion, four hundred sixty million, five hundred fifty-four thousand, eight hundred nine".