1665425065920 has 672 divisors, whose sum is σ = 6722732588544. Its totient is φ = 341879070720.

The previous prime is 1665425065883. The next prime is 1665425065939. The reversal of 1665425065920 is 295605245661.

It is a tau number, because it is divible by the number of its divisors (672).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 67476622 + ... + 67501298.

It is an arithmetic number, because the mean of its divisors is an integer number (10004066352).

Almost surely, 2^{1665425065920} is an apocalyptic number.

1665425065920 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 1665425065920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3361366294272).

1665425065920 is an abundant number, since it is smaller than the sum of its proper divisors (5057307522624).

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

1665425065920 is a wasteful number, since it uses less digits than its factorization.

1665425065920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24809 (or 24788 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 51.

The spelling of 1665425065920 in words is "one trillion, six hundred sixty-five billion, four hundred twenty-five million, sixty-five thousand, nine hundred twenty".