1116821231661 has 8 divisors (see below), whose sum is σ = 1491062078944. Its totient is φ = 743563936080.

The previous prime is 1116821231629. The next prime is 1116821231677. The reversal of 1116821231661 is 1661321286111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1116821231661 - 2⁵ = 1116821231629 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 (1116821231161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245885275 + ... + 245889816.

It is an arithmetic number, because the mean of its divisors is an integer number (186382759868).

Almost surely, 2^{1116821231661} is an apocalyptic number.

It is an amenable number.

1116821231661 is a deficient number, since it is larger than the sum of its proper divisors (374240847283).

1116821231661 is an equidigital number, since it uses as much as digits as its factorization.

1116821231661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491775851.

The product of its digits is 20736, while the sum is 39.

The spelling of 1116821231661 in words is "one trillion, one hundred sixteen billion, eight hundred twenty-one million, two hundred thirty-one thousand, six hundred sixty-one".