1155665550 has 48 divisors (see below), whose sum is σ = 3086521200. Its totient is φ = 284471040.

The previous prime is 1155665531. The next prime is 1155665561. The reversal of 1155665550 is 555665511.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1155665499 and 1155665508.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 294375 + ... + 298274.

It is an arithmetic number, because the mean of its divisors is an integer number (64302525).

Almost surely, 2^1155665550 is an apocalyptic number.

1155665550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1155665550 is an abundant number, since it is smaller than the sum of its proper divisors (1930855650).

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

1155665550 is a wasteful number, since it uses less digits than its factorization.

1155665550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592677 (or 592672 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 39.

The square root of 1155665550 is about 33995.0812618532. The cubic root of 1155665550 is about 1049.4072391253.

Subtracting from 1155665550 its sum of digits (39), we obtain a palindrome (1155665511).

It can be divided in two parts, 115 and 5665550, that added together give a palindrome (5665665).

The spelling of 1155665550 in words is "one billion, one hundred fifty-five million, six hundred sixty-five thousand, five hundred fifty".