1665848664576 has 800 divisors, whose sum is σ = 5521395179520. Its totient is φ = 497912832000.

The previous prime is 1665848664559. The next prime is 1665848664577. The reversal of 1665848664576 is 6754668485661.

It is a happy number.

1665848664576 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 8 + 48 + 6 + 6 + 4 + 576 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (1665848664577) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1148068651 + ... + 1148070101.

Almost surely, 2^{1665848664576} is an apocalyptic number.

1665848664576 is a gapful number since it is divisible by the number (16) 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 1665848664576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2760697589760).

1665848664576 is an abundant number, since it is smaller than the sum of its proper divisors (3855546514944).

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

1665848664576 is a wasteful number, since it uses less digits than its factorization.

1665848664576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578 (or 1553 counting only the distinct ones).

The product of its digits is 1393459200, while the sum is 72.

The spelling of 1665848664576 in words is "one trillion, six hundred sixty-five billion, eight hundred forty-eight million, six hundred sixty-four thousand, five hundred seventy-six".