1155798558 has 40 divisors (see below), whose sum is σ = 2592769608. Its totient is φ = 384831216.

The previous prime is 1155798551. The next prime is 1155798571. The reversal of 1155798558 is 8558975511.

1155798558 is a `hidden beast` number, since 1 + 1 + 557 + 9 + 85 + 5 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155798551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 160585 + ... + 167627.

Almost surely, 2^1155798558 is an apocalyptic number.

1155798558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1155798558 is an abundant number, since it is smaller than the sum of its proper divisors (1436971050).

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

1155798558 is a wasteful number, since it uses less digits than its factorization.

1155798558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8070 (or 8061 counting only the distinct ones).

The product of its digits is 2520000, while the sum is 54.

The square root of 1155798558 is about 33997.0374885813. The cubic root of 1155798558 is about 1049.4474970828.

The spelling of 1155798558 in words is "one billion, one hundred fifty-five million, seven hundred ninety-eight thousand, five hundred fifty-eight".