1665725020 has 24 divisors (see below), whose sum is σ = 3506119344. Its totient is φ = 664747776.

The previous prime is 1665724909. The next prime is 1665725051. The reversal of 1665725020 is 205275661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87514 + ... + 104833.

It is an arithmetic number, because the mean of its divisors is an integer number (146088306).

Almost surely, 2^1665725020 is an apocalyptic number.

1665725020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665725020 is an abundant number, since it is smaller than the sum of its proper divisors (1840394324).

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

1665725020 is a wasteful number, since it uses less digits than its factorization.

1665725020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192789 (or 192787 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 1665725020 is about 40813.2946477003. The cubic root of 1665725020 is about 1185.4077703167.

The spelling of 1665725020 in words is "one billion, six hundred sixty-five million, seven hundred twenty-five thousand, twenty".