1265645340544 has 64 divisors (see below), whose sum is σ = 2715682263840. Its totient is φ = 584074008576.

The previous prime is 1265645340511. The next prime is 1265645340551. The reversal of 1265645340544 is 4450435465621.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15422629 + ... + 15504475.

Almost surely, 2^{1265645340544} is an apocalyptic number.

It is an amenable number.

1265645340544 is an abundant number, since it is smaller than the sum of its proper divisors (1450036923296).

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

1265645340544 is an equidigital number, since it uses as much as digits as its factorization.

1265645340544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91167 (or 91155 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 49.

The spelling of 1265645340544 in words is "one trillion, two hundred sixty-five billion, six hundred forty-five million, three hundred forty thousand, five hundred forty-four".