1116712001661 has 4 divisors (see below), whose sum is σ = 1488949335552. Its totient is φ = 744474667772.

The previous prime is 1116712001623. The next prime is 1116712001689. The reversal of 1116712001661 is 1661002176111.

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-1116712001661 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1116712001611) 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, 186118666941 + ... + 186118666946.

It is an arithmetic number, because the mean of its divisors is an integer number (372237333888).

Almost surely, 2^{1116712001661} is an apocalyptic number.

It is an amenable number.

1116712001661 is a deficient number, since it is larger than the sum of its proper divisors (372237333891).

1116712001661 is an equidigital number, since it uses as much as digits as its factorization.

1116712001661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372237333890.

The product of its (nonzero) digits is 3024, while the sum is 33.

Adding to 1116712001661 its reverse (1661002176111), we get a palindrome (2777714177772).

The spelling of 1116712001661 in words is "one trillion, one hundred sixteen billion, seven hundred twelve million, one thousand, six hundred sixty-one".