1818468649 has 4 divisors (see below), whose sum is σ = 1877128960. Its totient is φ = 1759808340.

The previous prime is 1818468629. The next prime is 1818468661. The reversal of 1818468649 is 9468648181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9468648181 = 2269 ⋅4173049.

It is a cyclic number.

It is not a de Polignac number, because 1818468649 - 2⁹ = 1818468137 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 1818468649.

It is not an unprimeable number, because it can be changed into a prime (1818468629) 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, 29330109 + ... + 29330170.

It is an arithmetic number, because the mean of its divisors is an integer number (469282240).

Almost surely, 2^1818468649 is an apocalyptic number.

It is an amenable number.

1818468649 is a deficient number, since it is larger than the sum of its proper divisors (58660311).

1818468649 is an equidigital number, since it uses as much as digits as its factorization.

1818468649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58660310.

The product of its digits is 2654208, while the sum is 55.

The square root of 1818468649 is about 42643.5065279580. The cubic root of 1818468649 is about 1220.5866230616.

The spelling of 1818468649 in words is "one billion, eight hundred eighteen million, four hundred sixty-eight thousand, six hundred forty-nine".