1666818518 has 8 divisors (see below), whose sum is σ = 2547402048. Its totient is φ = 817684504.

The previous prime is 1666818511. The next prime is 1666818521. The reversal of 1666818518 is 8158186661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666818511) 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, 7862246 + ... + 7862457.

It is an arithmetic number, because the mean of its divisors is an integer number (318425256).

Almost surely, 2^1666818518 is an apocalyptic number.

1666818518 is a deficient number, since it is larger than the sum of its proper divisors (880583530).

1666818518 is a wasteful number, since it uses less digits than its factorization.

1666818518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15724758.

The product of its digits is 552960, while the sum is 50.

The square root of 1666818518 is about 40826.6887954436. The cubic root of 1666818518 is about 1185.6671083359.

The spelling of 1666818518 in words is "one billion, six hundred sixty-six million, eight hundred eighteen thousand, five hundred eighteen".