1665353669472 has 192 divisors, whose sum is σ = 5130575493120. Its totient is φ = 524717222400.

The previous prime is 1665353669471. The next prime is 1665353669501. The reversal of 1665353669472 is 2749663535661.

1665353669472 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 3 + 536 + 6 + 94 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665353669471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 428722 + ... + 1874702.

It is an arithmetic number, because the mean of its divisors is an integer number (26721747360).

Almost surely, 2^{1665353669472} is an apocalyptic number.

1665353669472 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 1665353669472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2565287746560).

1665353669472 is an abundant number, since it is smaller than the sum of its proper divisors (3465221823648).

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

1665353669472 is a wasteful number, since it uses less digits than its factorization.

1665353669472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446074 (or 1446060 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 63.

The spelling of 1665353669472 in words is "one trillion, six hundred sixty-five billion, three hundred fifty-three million, six hundred sixty-nine thousand, four hundred seventy-two".