1918606618 has 4 divisors (see below), whose sum is σ = 2877909930. Its totient is φ = 959303308.

The previous prime is 1918606589. The next prime is 1918606649. The reversal of 1918606618 is 8166068191.

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 only one way, i.e., 984265129 + 934341489 = 31373^2 + 30567^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 479651653 + ... + 479651656.

Almost surely, 2^1918606618 is an apocalyptic number.

1918606618 is a deficient number, since it is larger than the sum of its proper divisors (959303312).

1918606618 is an equidigital number, since it uses as much as digits as its factorization.

1918606618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959303311.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 1918606618 is about 43801.9019906670. The cubic root of 1918606618 is about 1242.5922656027.

The spelling of 1918606618 in words is "one billion, nine hundred eighteen million, six hundred six thousand, six hundred eighteen".