1101155665 has 16 divisors (see below), whose sum is σ = 1369313280. Its totient is φ = 849078720.

The previous prime is 1101155663. The next prime is 1101155669. The reversal of 1101155665 is 5665511011.

It is not a de Polignac number, because 1101155665 - 2¹ = 1101155663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1101155663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81760 + ... + 94270.

It is an arithmetic number, because the mean of its divisors is an integer number (85582080).

Almost surely, 2^1101155665 is an apocalyptic number.

It is an amenable number.

1101155665 is a deficient number, since it is larger than the sum of its proper divisors (268157615).

1101155665 is a wasteful number, since it uses less digits than its factorization.

1101155665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13152.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 1101155665 is about 33183.6656353695. The cubic root of 1101155665 is about 1032.6414949907.

Adding to 1101155665 its reverse (5665511011), we get a palindrome (6766666676).

The spelling of 1101155665 in words is "one billion, one hundred one million, one hundred fifty-five thousand, six hundred sixty-five".