545416466663221 has 4 divisors (see below), whose sum is σ = 545416522742700. Its totient is φ = 545416410583744.

The previous prime is 545416466663153. The next prime is 545416466663267. The reversal of 545416466663221 is 122366664614545.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 539408521528900 + 6007945134321 = 23225170^2 + 2451111^2 .

It is a cyclic number.

It is not a de Polignac number, because 545416466663221 - 2¹³ = 545416466655029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545416466663221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545416466663821) 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, 9257236 + ... + 34300573.

It is an arithmetic number, because the mean of its divisors is an integer number (136354130685675).

Almost surely, 2^{545416466663221} is an apocalyptic number.

It is an amenable number.

545416466663221 is a deficient number, since it is larger than the sum of its proper divisors (56079479).

545416466663221 is a wasteful number, since it uses less digits than its factorization.

545416466663221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56079478.

The product of its digits is 149299200, while the sum is 61.

The spelling of 545416466663221 in words is "five hundred forty-five trillion, four hundred sixteen billion, four hundred sixty-six million, six hundred sixty-three thousand, two hundred twenty-one".