1445878787809 has 3 divisors (see below), whose sum is σ = 1445879990257. Its totient is φ = 1445877585362.

The previous prime is 1445878787791. The next prime is 1445878787869. The reversal of 1445878787809 is 9087878785441.

The square root of 1445878787809 is 1202447.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1445878787809 - 2⁵ = 1445878787777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1445878787869) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 601224 + ... + 1803670.

Almost surely, 2^{1445878787809} is an apocalyptic number.

1445878787809 is the 1202447-th square number.

1445878787809 is the 601224-th centered octagonal number.

It is an amenable number.

1445878787809 is a deficient number, since it is larger than the sum of its proper divisors (1202448).

1445878787809 is an frugal number, since it uses more digits than its factorization.

1445878787809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404894 (or 1202447 counting only the distinct ones).

The product of its (nonzero) digits is 1011548160, while the sum is 76.

It can be divided in two parts, 14458787 and 87809, that added together give a square (14546596 = 3814²).

The spelling of 1445878787809 in words is "one trillion, four hundred forty-five billion, eight hundred seventy-eight million, seven hundred eighty-seven thousand, eight hundred nine".