1116611661 has 48 divisors (see below), whose sum is σ = 1709144064. Its totient is φ = 642360000.

The previous prime is 1116611609. The next prime is 1116611669. The reversal of 1116611661 is 1661166111.

It is not a de Polignac number, because 1116611661 - 2⁶ = 1116611597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1116611669) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10435570 + ... + 10435676.

It is an arithmetic number, because the mean of its divisors is an integer number (35607168).

Almost surely, 2^1116611661 is an apocalyptic number.

1116611661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1116611661 is a deficient number, since it is larger than the sum of its proper divisors (592532403).

1116611661 is a wasteful number, since it uses less digits than its factorization.

1116611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 253 counting only the distinct ones).

The product of its digits is 1296, while the sum is 30.

The square root of 1116611661 is about 33415.7397194795. The cubic root of 1116611661 is about 1037.4505047468.

Adding to 1116611661 its reverse (1661166111), we get a palindrome (2777777772).

The spelling of 1116611661 in words is "one billion, one hundred sixteen million, six hundred eleven thousand, six hundred sixty-one".