1255216565 has 16 divisors (see below), whose sum is σ = 1529149440. Its totient is φ = 989029440.

The previous prime is 1255216561. The next prime is 1255216583. The reversal of 1255216565 is 5656125521.

It is not a de Polignac number, because 1255216565 - 2² = 1255216561 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255216561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81155 + ... + 95375.

It is an arithmetic number, because the mean of its divisors is an integer number (95571840).

Almost surely, 2^1255216565 is an apocalyptic number.

It is an amenable number.

1255216565 is a deficient number, since it is larger than the sum of its proper divisors (273932875).

1255216565 is a wasteful number, since it uses less digits than its factorization.

1255216565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14492.

The product of its digits is 90000, while the sum is 38.

The square root of 1255216565 is about 35429.0356205189. The cubic root of 1255216565 is about 1078.7137651095.

The spelling of 1255216565 in words is "one billion, two hundred fifty-five million, two hundred sixteen thousand, five hundred sixty-five".