2251356255065 has 4 divisors (see below), whose sum is σ = 2701627506084. Its totient is φ = 1801085004048.

The previous prime is 2251356255037. The next prime is 2251356255067. The reversal of 2251356255065 is 5605526531522.

It is a happy number.

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 1173380733529 + 1077975521536 = 1083227^2 + 1038256^2 .

It is a cyclic number.

It is not a de Polignac number, because 2251356255065 - 2⁴⁰ = 1151844627289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2251356255067) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 225135625502 + ... + 225135625511.

It is an arithmetic number, because the mean of its divisors is an integer number (675406876521).

Almost surely, 2^{2251356255065} is an apocalyptic number.

It is an amenable number.

2251356255065 is a deficient number, since it is larger than the sum of its proper divisors (450271251019).

2251356255065 is an equidigital number, since it uses as much as digits as its factorization.

2251356255065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450271251018.

The product of its (nonzero) digits is 2700000, while the sum is 47.

The spelling of 2251356255065 in words is "two trillion, two hundred fifty-one billion, three hundred fifty-six million, two hundred fifty-five thousand, sixty-five".