1665225760 has 192 divisors, whose sum is σ = 4626284544. Its totient is φ = 560102400.

The previous prime is 1665225719. The next prime is 1665225773. The reversal of 1665225760 is 675225661.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1254217 + ... + 1255543.

It is an arithmetic number, because the mean of its divisors is an integer number (24095232).

Almost surely, 2^1665225760 is an apocalyptic number.

1665225760 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 1665225760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2313142272).

1665225760 is an abundant number, since it is smaller than the sum of its proper divisors (2961058784).

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

1665225760 is a wasteful number, since it uses less digits than its factorization.

1665225760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407 (or 1399 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 1665225760 is about 40807.1777999900. The cubic root of 1665225760 is about 1185.2893262328.

Subtracting from 1665225760 its reverse (675225661), we obtain a palindrome (990000099).

The spelling of 1665225760 in words is "one billion, six hundred sixty-five million, two hundred twenty-five thousand, seven hundred sixty".