1668115555 has 32 divisors (see below), whose sum is σ = 2104185600. Its totient is φ = 1268356992.

The previous prime is 1668115451. The next prime is 1668115567. The reversal of 1668115555 is 5555118661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1668115555 - 2²³ = 1659726947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

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 in 31 ways as a sum of consecutive naturals, for example, 1356681 + ... + 1357909.

It is an arithmetic number, because the mean of its divisors is an integer number (65755800).

Almost surely, 2^1668115555 is an apocalyptic number.

1668115555 is a deficient number, since it is larger than the sum of its proper divisors (436070045).

1668115555 is a wasteful number, since it uses less digits than its factorization.

1668115555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443.

The product of its digits is 180000, while the sum is 43.

The square root of 1668115555 is about 40842.5703769976. The cubic root of 1668115555 is about 1185.9745714001.

The spelling of 1668115555 in words is "one billion, six hundred sixty-eight million, one hundred fifteen thousand, five hundred fifty-five".