6506921820941 has 2 divisors, whose sum is σ = 6506921820942. Its totient is φ = 6506921820940.

The previous prime is 6506921820907. The next prime is 6506921821033. The reversal of 6506921820941 is 1490281296056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6491310318025 + 15611502916 = 2547805^2 + 124946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6506921820941 is a prime.

It is a super-2 number, since 2×6506921820941² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6506921822941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3253460910470 + 3253460910471.

It is an arithmetic number, because the mean of its divisors is an integer number (3253460910471).

Almost surely, 2^{6506921820941} is an apocalyptic number.

It is an amenable number.

6506921820941 is a deficient number, since it is larger than the sum of its proper divisors (1).

6506921820941 is an equidigital number, since it uses as much as digits as its factorization.

6506921820941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 6506921820941 in words is "six trillion, five hundred six billion, nine hundred twenty-one million, eight hundred twenty thousand, nine hundred forty-one".