543564122621 has 16 divisors (see below), whose sum is σ = 605586118704. Its totient is φ = 484627152384.

The previous prime is 543564122611. The next prime is 543564122657. The reversal of 543564122621 is 126221465345.

It can be written as a sum of positive squares in 8 ways, for example, as 5191202500 + 538372920121 = 72050^2 + 733739^2 .

It is a cyclic number.

It is not a de Polignac number, because 543564122621 - 2²⁶ = 543497013757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (543564122611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4058450 + ... + 4190243.

It is an arithmetic number, because the mean of its divisors is an integer number (37849132419).

Almost surely, 2^543564122621 is an apocalyptic number.

It is an amenable number.

543564122621 is a deficient number, since it is larger than the sum of its proper divisors (62021996083).

543564122621 is a wasteful number, since it uses less digits than its factorization.

543564122621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8248880.

The product of its digits is 345600, while the sum is 41.

Adding to 543564122621 its reverse (126221465345), we get a palindrome (669785587966).

The spelling of 543564122621 in words is "five hundred forty-three billion, five hundred sixty-four million, one hundred twenty-two thousand, six hundred twenty-one".