1443660661 has 2 divisors, whose sum is σ = 1443660662. Its totient is φ = 1443660660.

The previous prime is 1443660643. The next prime is 1443660671. The reversal of 1443660661 is 1660663441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881733636 + 561927025 = 29694^2 + 23705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1443660661 - 2⁹ = 1443660149 is a prime.

It is a super-2 number, since 2×1443660661² = 4168312208237913842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1443660661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1443660611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 721830330 + 721830331.

It is an arithmetic number, because the mean of its divisors is an integer number (721830331).

Almost surely, 2^1443660661 is an apocalyptic number.

It is an amenable number.

1443660661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1443660661 is an equidigital number, since it uses as much as digits as its factorization.

1443660661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 1443660661 is about 37995.5347508099. The cubic root of 1443660661 is about 1130.1993177006.

The spelling of 1443660661 in words is "one billion, four hundred forty-three million, six hundred sixty thousand, six hundred sixty-one".