545661416221 has 4 divisors (see below), whose sum is σ = 545662893600. Its totient is φ = 545659938844.

The previous prime is 545661416219. The next prime is 545661416227. The reversal of 545661416221 is 122614166545.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 545661416221 - 2¹ = 545661416219 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 (545661416227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369120 + ... + 1107958.

It is an arithmetic number, because the mean of its divisors is an integer number (136415723400).

Almost surely, 2^545661416221 is an apocalyptic number.

It is an amenable number.

545661416221 is a deficient number, since it is larger than the sum of its proper divisors (1477379).

545661416221 is an equidigital number, since it uses as much as digits as its factorization.

545661416221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477378.

The product of its digits is 345600, while the sum is 43.

The spelling of 545661416221 in words is "five hundred forty-five billion, six hundred sixty-one million, four hundred sixteen thousand, two hundred twenty-one".