1665538875 has 512 divisors, whose sum is σ = 4528742400. Its totient is φ = 580608000.

The previous prime is 1665538867. The next prime is 1665538913. The reversal of 1665538875 is 5788355661.

1665538875 is a `hidden beast` number, since 1 + 6 + 6 + 553 + 8 + 87 + 5 = 666.

1665538875 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1665538875 - 2³ = 1665538867 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 57432361 + ... + 57432389.

It is an arithmetic number, because the mean of its divisors is an integer number (8845200).

Almost surely, 2^1665538875 is an apocalyptic number.

1665538875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1665538875 is an abundant number, since it is smaller than the sum of its proper divisors (2863203525).

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

1665538875 is a wasteful number, since it uses less digits than its factorization.

1665538875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 85 counting only the distinct ones).

The product of its digits is 6048000, while the sum is 54.

The square root of 1665538875 is about 40811.0141383426. The cubic root of 1665538875 is about 1185.3636121780.

The spelling of 1665538875 in words is "one billion, six hundred sixty-five million, five hundred thirty-eight thousand, eight hundred seventy-five".