11135531661 has 16 divisors (see below), whose sum is σ = 14965642944. Its totient is φ = 7364626304.

The previous prime is 11135531657. The next prime is 11135531699. The reversal of 11135531661 is 16613553111.

It is a cyclic number.

It is not a de Polignac number, because 11135531661 - 2² = 11135531657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11135531611) 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, 677011 + ... + 693263.

It is an arithmetic number, because the mean of its divisors is an integer number (935352684).

Almost surely, 2^11135531661 is an apocalyptic number.

It is an amenable number.

11135531661 is a deficient number, since it is larger than the sum of its proper divisors (3830111283).

11135531661 is a wasteful number, since it uses less digits than its factorization.

11135531661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18060.

The product of its digits is 8100, while the sum is 33.

The spelling of 11135531661 in words is "eleven billion, one hundred thirty-five million, five hundred thirty-one thousand, six hundred sixty-one".