1155507221550 has 48 divisors (see below), whose sum is σ = 3126172269312. Its totient is φ = 280122962400.

The previous prime is 1155507221549. The next prime is 1155507221563. The reversal of 1155507221550 is 551227055511.

It is a junction number, because it is equal to n+sod(n) for n = 1155507221499 and 1155507221508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 350152054 + ... + 350155353.

It is an arithmetic number, because the mean of its divisors is an integer number (65128588944).

Almost surely, 2^{1155507221550} is an apocalyptic number.

1155507221550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1155507221550 is an abundant number, since it is smaller than the sum of its proper divisors (1970665047762).

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

1155507221550 is a wasteful number, since it uses less digits than its factorization.

1155507221550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700307433 (or 700307428 counting only the distinct ones).

The product of its (nonzero) digits is 87500, while the sum is 39.

It can be divided in two parts, 1155 and 507221550, that added together give a palindrome (507222705).

The spelling of 1155507221550 in words is "one trillion, one hundred fifty-five billion, five hundred seven million, two hundred twenty-one thousand, five hundred fifty".