1668077818 has 16 divisors (see below), whose sum is σ = 2774331360. Its totient is φ = 745786800.

The previous prime is 1668077779. The next prime is 1668077821. The reversal of 1668077818 is 8187708661.

It is a super-2 number, since 2×1668077818² = 5564967213807282248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620148 + ... + 622831.

It is an arithmetic number, because the mean of its divisors is an integer number (173395710).

Almost surely, 2^1668077818 is an apocalyptic number.

1668077818 is a deficient number, since it is larger than the sum of its proper divisors (1106253542).

1668077818 is a wasteful number, since it uses less digits than its factorization.

1668077818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243053.

The product of its (nonzero) digits is 903168, while the sum is 52.

The square root of 1668077818 is about 40842.1083931768. The cubic root of 1668077818 is about 1185.9656280829.

The spelling of 1668077818 in words is "one billion, six hundred sixty-eight million, seventy-seven thousand, eight hundred eighteen".