8518256749 has 4 divisors (see below), whose sum is σ = 8528243836. Its totient is φ = 8508269664.

The previous prime is 8518256731. The next prime is 8518256783. The reversal of 8518256749 is 9476528158.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9476528158 = 2 ⋅4738264079.

It can be written as a sum of positive squares in 2 ways, for example, as 1615638025 + 6902618724 = 40195^2 + 83082^2 .

It is a cyclic number.

It is not a de Polignac number, because 8518256749 - 2⁹ = 8518256237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8518256749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8518257749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4992264 + ... + 4993969.

It is an arithmetic number, because the mean of its divisors is an integer number (2132060959).

Almost surely, 2^8518256749 is an apocalyptic number.

It is an amenable number.

8518256749 is a deficient number, since it is larger than the sum of its proper divisors (9987087).

8518256749 is an equidigital number, since it uses as much as digits as its factorization.

8518256749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9987086.

The product of its digits is 4838400, while the sum is 55.

The square root of 8518256749 is about 92294.4025875892. The cubic root of 8518256749 is about 2042.2876385119.

The spelling of 8518256749 in words is "eight billion, five hundred eighteen million, two hundred fifty-six thousand, seven hundred forty-nine".