1661331119984 has 40 divisors (see below), whose sum is σ = 3273981344640. Its totient is φ = 816437835200.

The previous prime is 1661331119977. The next prime is 1661331120023. The reversal of 1661331119984 is 4899111331661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5120519 + ... + 5435289.

It is an arithmetic number, because the mean of its divisors is an integer number (81849533616).

Almost surely, 2^{1661331119984} is an apocalyptic number.

It is an amenable number.

1661331119984 is a deficient number, since it is larger than the sum of its proper divisors (1612650224656).

1661331119984 is a wasteful number, since it uses less digits than its factorization.

1661331119984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320429 (or 320423 counting only the distinct ones).

The product of its digits is 839808, while the sum is 53.

The spelling of 1661331119984 in words is "one trillion, six hundred sixty-one billion, three hundred thirty-one million, one hundred nineteen thousand, nine hundred eighty-four".