1442663256521 has 2 divisors, whose sum is σ = 1442663256522. Its totient is φ = 1442663256520.

The previous prime is 1442663256481. The next prime is 1442663256523. The reversal of 1442663256521 is 1256523662441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1426448035600 + 16215220921 = 1194340^2 + 127339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1442663256521 - 2²² = 1442659062217 is a prime.

Together with 1442663256523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1442663256523) 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 as a sum of consecutive naturals, namely, 721331628260 + 721331628261.

It is an arithmetic number, because the mean of its divisors is an integer number (721331628261).

Almost surely, 2^{1442663256521} is an apocalyptic number.

It is an amenable number.

1442663256521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1442663256521 is an equidigital number, since it uses as much as digits as its factorization.

1442663256521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2073600, while the sum is 47.

The spelling of 1442663256521 in words is "one trillion, four hundred forty-two billion, six hundred sixty-three million, two hundred fifty-six thousand, five hundred twenty-one".