1443201031661 has 4 divisors (see below), whose sum is σ = 1528095210012. Its totient is φ = 1358306853312.

The previous prime is 1443201031639. The next prime is 1443201031667. The reversal of 1443201031661 is 1661301023441.

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 1260343022500 + 182858009161 = 1122650^2 + 427619^2 .

It is not a de Polignac number, because 1443201031661 - 2¹⁰ = 1443201030637 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 (1443201031667) 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, 42447089150 + ... + 42447089183.

It is an arithmetic number, because the mean of its divisors is an integer number (382023802503).

Almost surely, 2^{1443201031661} is an apocalyptic number.

It is an amenable number.

1443201031661 is a deficient number, since it is larger than the sum of its proper divisors (84894178351).

1443201031661 is an equidigital number, since it uses as much as digits as its factorization.

1443201031661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84894178350.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 1443201031661 in words is "one trillion, four hundred forty-three billion, two hundred one million, thirty-one thousand, six hundred sixty-one".