1661483923200 has 648 divisors, whose sum is σ = 6174273321216. Its totient is φ = 442050048000.

The previous prime is 1661483923181. The next prime is 1661483923201. The reversal of 1661483923200 is 23293841661.

1661483923200 is a `hidden beast` number, since 1 + 6 + 61 + 483 + 92 + 3 + 20 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (648).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661483923201) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 888018265 + ... + 888020135.

Almost surely, 2^{1661483923200} is an apocalyptic number.

1661483923200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661483923200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3087136660608).

1661483923200 is an abundant number, since it is smaller than the sum of its proper divisors (4512789398016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661483923200 is an equidigital number, since it uses as much as digits as its factorization.

1661483923200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2483 (or 2452 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 1661483923200 in words is "one trillion, six hundred sixty-one billion, four hundred eighty-three million, nine hundred twenty-three thousand, two hundred".