1662354363221 has 4 divisors (see below), whose sum is σ = 1719676927500. Its totient is φ = 1605031798944.

The previous prime is 1662354363199. The next prime is 1662354363239. The reversal of 1662354363221 is 1223634532661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 556672671025 + 1105681692196 = 746105^2 + 1051514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662354363221 - 2¹⁴ = 1662354346837 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 (1662354393221) 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, 28661282096 + ... + 28661282153.

It is an arithmetic number, because the mean of its divisors is an integer number (429919231875).

Almost surely, 2^{1662354363221} is an apocalyptic number.

It is an amenable number.

1662354363221 is a deficient number, since it is larger than the sum of its proper divisors (57322564279).

1662354363221 is an equidigital number, since it uses as much as digits as its factorization.

1662354363221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57322564278.

The product of its digits is 933120, while the sum is 44.

Adding to 1662354363221 its reverse (1223634532661), we get a palindrome (2885988895882).

The spelling of 1662354363221 in words is "one trillion, six hundred sixty-two billion, three hundred fifty-four million, three hundred sixty-three thousand, two hundred twenty-one".