1155555555 has 128 divisors (see below), whose sum is σ = 2408693760. Its totient is φ = 459164160.

The previous prime is 1155555553. The next prime is 1155555563. The reversal of 1155555555 is 5555555511.

It is not a de Polignac number, because 1155555555 - 2¹ = 1155555553 is a prime.

It is a nude number because it is divisible by every one of its digits.

1155555555 is a modest number, since divided by 55555 gives 11555 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1155555553) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2632026 + ... + 2632464.

It is an arithmetic number, because the mean of its divisors is an integer number (18817920).

Almost surely, 2^1155555555 is an apocalyptic number.

1155555555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1155555555 is an abundant number, since it is smaller than the sum of its proper divisors (1253138205).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155555555 is a wasteful number, since it uses less digits than its factorization.

1155555555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561.

The product of its digits is 390625, while the sum is 42.

The square root of 1155555555 is about 33993.4634157804. The cubic root of 1155555555 is about 1049.3739442528.

It can be divided in two parts, 115555555 and 5, that multiplied together give a palindrome (577777775).

The spelling of 1155555555 in words is "one billion, one hundred fifty-five million, five hundred fifty-five thousand, five hundred fifty-five".