1321565545105 has 32 divisors (see below), whose sum is σ = 1710808918560. Its totient is φ = 974246707200.

The previous prime is 1321565545093. The next prime is 1321565545163. The reversal of 1321565545105 is 5015455651231.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 789901447696 + 531664097409 = 888764^2 + 729153^2 .

It is not a de Polignac number, because 1321565545105 - 2¹⁹ = 1321565020817 is a prime.

It is a super-2 number, since 2×1321565545105² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167261655 + ... + 167269555.

It is an arithmetic number, because the mean of its divisors is an integer number (53462778705).

Almost surely, 2^{1321565545105} is an apocalyptic number.

It is an amenable number.

1321565545105 is a deficient number, since it is larger than the sum of its proper divisors (389243373455).

1321565545105 is a wasteful number, since it uses less digits than its factorization.

1321565545105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12021.

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 1321565545105 in words is "one trillion, three hundred twenty-one billion, five hundred sixty-five million, five hundred forty-five thousand, one hundred five".