1131668615821 has 8 divisors (see below), whose sum is σ = 1133006760704. Its totient is φ = 1130330868480.

The previous prime is 1131668615809. The next prime is 1131668615863. The reversal of 1131668615821 is 1285168661311.

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

It is a cyclic number.

It is not a de Polignac number, because 1131668615821 - 2²³ = 1131660227213 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 (1131668615321) 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, 5803510 + ... + 5995336.

It is an arithmetic number, because the mean of its divisors is an integer number (141625845088).

Almost surely, 2^{1131668615821} is an apocalyptic number.

It is an amenable number.

1131668615821 is a deficient number, since it is larger than the sum of its proper divisors (1338144883).

1131668615821 is an equidigital number, since it uses as much as digits as its factorization.

1131668615821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198771.

The product of its digits is 414720, while the sum is 49.

The spelling of 1131668615821 in words is "one trillion, one hundred thirty-one billion, six hundred sixty-eight million, six hundred fifteen thousand, eight hundred twenty-one".