1665021171492 has 180 divisors, whose sum is σ = 5071393012224. Its totient is φ = 474963562080.

The previous prime is 1665021171461. The next prime is 1665021171523. The reversal of 1665021171492 is 2941711205661.

1665021171492 is a `hidden beast` number, since 1 + 66 + 502 + 11 + 71 + 4 + 9 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1665021171461) and next prime (1665021171523).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 9934653 + ... + 10100859.

Almost surely, 2^{1665021171492} is an apocalyptic number.

1665021171492 is a gapful number since it is divisible by the number (12) 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 1665021171492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2535696506112).

1665021171492 is an abundant number, since it is smaller than the sum of its proper divisors (3406371840732).

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

1665021171492 is a wasteful number, since it uses less digits than its factorization.

1665021171492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166868 (or 166850 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 1665021171492 in words is "one trillion, six hundred sixty-five billion, twenty-one million, one hundred seventy-one thousand, four hundred ninety-two".