1660491190800 has 720 divisors, whose sum is σ = 6916548562560. Its totient is φ = 364442664960.

The previous prime is 1660491190793. The next prime is 1660491190811. The reversal of 1660491190800 is 80911940661.

1660491190800 is a `hidden beast` number, since 16 + 60 + 491 + 1 + 90 + 8 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a super-3 number, since 3×1660491190800³ (a number of 38 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 15061477 + ... + 15171323.

It is an arithmetic number, because the mean of its divisors is an integer number (9606317448).

Almost surely, 2^{1660491190800} is an apocalyptic number.

1660491190800 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 1660491190800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3458274281280).

1660491190800 is an abundant number, since it is smaller than the sum of its proper divisors (5256057371760).

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

1660491190800 is a wasteful number, since it uses less digits than its factorization.

1660491190800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109920 (or 109906 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 1660491190800 in words is "one trillion, six hundred sixty billion, four hundred ninety-one million, one hundred ninety thousand, eight hundred".