1305643421504 has 28 divisors (see below), whose sum is σ = 2727248596800. Its totient is φ = 618462672768.

The previous prime is 1305643421491. The next prime is 1305643421507. The reversal of 1305643421504 is 4051243465031.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305643421507) 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, 536858744 + ... + 536861175.

It is an arithmetic number, because the mean of its divisors is an integer number (97401735600).

Almost surely, 2^{1305643421504} is an apocalyptic number.

It is an amenable number.

1305643421504 is an abundant number, since it is smaller than the sum of its proper divisors (1421605175296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1305643421504 is a wasteful number, since it uses less digits than its factorization.

1305643421504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073719950 (or 1073719940 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 1305643421504 its reverse (4051243465031), we get a palindrome (5356886886535).

The spelling of 1305643421504 in words is "one trillion, three hundred five billion, six hundred forty-three million, four hundred twenty-one thousand, five hundred four".