1305645551556 has 48 divisors (see below), whose sum is σ = 3235227979200. Its totient is φ = 408660360192.

The previous prime is 1305645551437. The next prime is 1305645551563. The reversal of 1305645551556 is 6551555465031.

It is a super-2 number, since 2×1305645551556² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1305645551499 and 1305645551508.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25312801 + ... + 25364328.

It is an arithmetic number, because the mean of its divisors is an integer number (67400582900).

Almost surely, 2^{1305645551556} is an apocalyptic number.

It is an amenable number.

1305645551556 is an abundant number, since it is smaller than the sum of its proper divisors (1929582427644).

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

1305645551556 is a wasteful number, since it uses less digits than its factorization.

1305645551556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50677268 (or 50677266 counting only the distinct ones).

The product of its (nonzero) digits is 6750000, while the sum is 51.

The spelling of 1305645551556 in words is "one trillion, three hundred five billion, six hundred forty-five million, five hundred fifty-one thousand, five hundred fifty-six".