1918666911 has 32 divisors (see below), whose sum is σ = 3176857600. Its totient is φ = 1005164640.

The previous prime is 1918666859. The next prime is 1918666913. The reversal of 1918666911 is 1196668191.

It is a happy number.

1918666911 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-1918666911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918666913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65191 + ... + 89928.

It is an arithmetic number, because the mean of its divisors is an integer number (99276800).

Almost surely, 2^1918666911 is an apocalyptic number.

1918666911 is a deficient number, since it is larger than the sum of its proper divisors (1258190689).

1918666911 is a wasteful number, since it uses less digits than its factorization.

1918666911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155179.

The product of its digits is 139968, while the sum is 48.

The square root of 1918666911 is about 43802.5902316290. The cubic root of 1918666911 is about 1242.6052817902.

The spelling of 1918666911 in words is "one billion, nine hundred eighteen million, six hundred sixty-six thousand, nine hundred eleven".