1155015555 has 16 divisors (see below), whose sum is σ = 1859366400. Its totient is φ = 612227808.

The previous prime is 1155015517. The next prime is 1155015637. The reversal of 1155015555 is 5555105511.

It is not a de Polignac number, because 1155015555 - 2¹⁴ = 1154999171 is a prime.

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, 233755 + ... + 238644.

It is an arithmetic number, because the mean of its divisors is an integer number (116210400).

Almost surely, 2^1155015555 is an apocalyptic number.

1155015555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1155015555 is a deficient number, since it is larger than the sum of its proper divisors (704350845).

1155015555 is a wasteful number, since it uses less digits than its factorization.

1155015555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472570.

The product of its (nonzero) digits is 15625, while the sum is 33.

The square root of 1155015555 is about 33985.5197841669. The cubic root of 1155015555 is about 1049.2104586120.

The spelling of 1155015555 in words is "one billion, one hundred fifty-five million, fifteen thousand, five hundred fifty-five".