11251051065 has 20 divisors (see below), whose sum is σ = 20168551524. Its totient is φ = 6000560352.

The previous prime is 11251051037. The next prime is 11251051069. The reversal of 11251051065 is 56015015211.

It can be written as a sum of positive squares in 2 ways, for example, as 6346990224 + 4904060841 = 79668^2 + 70029^2 .

It is not a de Polignac number, because 11251051065 - 2¹⁴ = 11251034681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11251051069) 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 19 ways as a sum of consecutive naturals, for example, 13889782 + ... + 13890591.

Almost surely, 2^11251051065 is an apocalyptic number.

11251051065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11251051065 is a deficient number, since it is larger than the sum of its proper divisors (8917500459).

11251051065 is an equidigital number, since it uses as much as digits as its factorization.

11251051065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27780390 (or 27780381 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

Adding to 11251051065 its reverse (56015015211), we get a palindrome (67266066276).

The spelling of 11251051065 in words is "eleven billion, two hundred fifty-one million, fifty-one thousand, sixty-five".