11001031661 has 4 divisors (see below), whose sum is σ = 11003235552. Its totient is φ = 10998827772.

The previous prime is 11001031649. The next prime is 11001031667. The reversal of 11001031661 is 16613010011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11001031661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001031667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094441 + ... + 1104446.

It is an arithmetic number, because the mean of its divisors is an integer number (2750808888).

Almost surely, 2^11001031661 is an apocalyptic number.

It is an amenable number.

11001031661 is a deficient number, since it is larger than the sum of its proper divisors (2203891).

11001031661 is an equidigital number, since it uses as much as digits as its factorization.

11001031661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203890.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 11001031661 its reverse (16613010011), we get a palindrome (27614041672).

The spelling of 11001031661 in words is "eleven billion, one million, thirty-one thousand, six hundred sixty-one".