1316225506565 has 4 divisors (see below), whose sum is σ = 1579470607884. Its totient is φ = 1052980405248.

The previous prime is 1316225506537. The next prime is 1316225506573. The reversal of 1316225506565 is 5656055226131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 255972247969 + 1060253258596 = 505937^2 + 1029686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316225506565 - 2¹⁸ = 1316225244421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131622550652 + ... + 131622550661.

It is an arithmetic number, because the mean of its divisors is an integer number (394867651971).

Almost surely, 2^{1316225506565} is an apocalyptic number.

It is an amenable number.

1316225506565 is a deficient number, since it is larger than the sum of its proper divisors (263245101319).

1316225506565 is an equidigital number, since it uses as much as digits as its factorization.

1316225506565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263245101318.

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 1316225506565 in words is "one trillion, three hundred sixteen billion, two hundred twenty-five million, five hundred six thousand, five hundred sixty-five".