1442651661521 has 4 divisors (see below), whose sum is σ = 1648744756032. Its totient is φ = 1236558567012.

The previous prime is 1442651661511. The next prime is 1442651661553. The reversal of 1442651661521 is 1251661562441.

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.

It is a cyclic number.

It is not a de Polignac number, because 1442651661521 - 2³⁰ = 1441577919697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1442651661511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103046547245 + ... + 103046547258.

It is an arithmetic number, because the mean of its divisors is an integer number (412186189008).

Almost surely, 2^{1442651661521} is an apocalyptic number.

It is an amenable number.

1442651661521 is a deficient number, since it is larger than the sum of its proper divisors (206093094511).

1442651661521 is an equidigital number, since it uses as much as digits as its factorization.

1442651661521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206093094510.

The product of its digits is 345600, while the sum is 44.

The spelling of 1442651661521 in words is "one trillion, four hundred forty-two billion, six hundred fifty-one million, six hundred sixty-one thousand, five hundred twenty-one".