1665025488 has 360 divisors, whose sum is σ = 5733561600. Its totient is φ = 449100288.

The previous prime is 1665025487. The next prime is 1665025511. The reversal of 1665025488 is 8845205661.

1665025488 is a `hidden beast` number, since 1 + 66 + 502 + 5 + 4 + 88 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665025487) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16165245 + ... + 16165347.

It is an arithmetic number, because the mean of its divisors is an integer number (15926560).

Almost surely, 2^1665025488 is an apocalyptic number.

1665025488 is a gapful number since it is divisible by the number (18) 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 1665025488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2866780800).

1665025488 is an abundant number, since it is smaller than the sum of its proper divisors (4068536112).

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

1665025488 is a wasteful number, since it uses less digits than its factorization.

1665025488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 1665025488 is about 40804.7238441826. The cubic root of 1665025488 is about 1185.2418071943.

The spelling of 1665025488 in words is "one billion, six hundred sixty-five million, twenty-five thousand, four hundred eighty-eight".