1165541355 has 48 divisors (see below), whose sum is σ = 2216279520. Its totient is φ = 561945600.

The previous prime is 1165541347. The next prime is 1165541381. The reversal of 1165541355 is 5531455611.

1165541355 is a `hidden beast` number, since 1 + 1 + 65 + 541 + 3 + 55 = 666.

It is not a de Polignac number, because 1165541355 - 2³ = 1165541347 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83091 + ... + 96099.

It is an arithmetic number, because the mean of its divisors is an integer number (46172490).

Almost surely, 2^1165541355 is an apocalyptic number.

1165541355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1165541355 is a deficient number, since it is larger than the sum of its proper divisors (1050738165).

1165541355 is a wasteful number, since it uses less digits than its factorization.

1165541355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13212 (or 13209 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 1165541355 is about 34140.0257029780. The cubic root of 1165541355 is about 1052.3880205771.

Adding to 1165541355 its reverse (5531455611), we get a palindrome (6696996966).

The spelling of 1165541355 in words is "one billion, one hundred sixty-five million, five hundred forty-one thousand, three hundred fifty-five".