1188555555 has 16 divisors (see below), whose sum is σ = 2074569984. Its totient is φ = 576269280.

The previous prime is 1188555541. The next prime is 1188555587. The reversal of 1188555555 is 5555558811.

It is a happy number.

It is not a de Polignac number, because 1188555555 - 2⁵ = 1188555523 is a prime.

1188555555 is a modest number, since divided by 55555 gives 11885 as remainder.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3601519 + ... + 3601848.

It is an arithmetic number, because the mean of its divisors is an integer number (129660624).

Almost surely, 2^1188555555 is an apocalyptic number.

1188555555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1188555555 is a deficient number, since it is larger than the sum of its proper divisors (886014429).

1188555555 is a wasteful number, since it uses less digits than its factorization.

1188555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7203386.

The product of its digits is 1000000, while the sum is 48.

The square root of 1188555555 is about 34475.4340799358. The cubic root of 1188555555 is about 1059.2695676872.

The spelling of 1188555555 in words is "one billion, one hundred eighty-eight million, five hundred fifty-five thousand, five hundred fifty-five".