1665671875 has 56 divisors (see below), whose sum is σ = 2419344032. Its totient is φ = 1123200000.

The previous prime is 1665671873. The next prime is 1665671923. The reversal of 1665671875 is 5781765661.

It is not a de Polignac number, because 1665671875 - 2¹ = 1665671873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665671873) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 10609297 + ... + 10609453.

It is an arithmetic number, because the mean of its divisors is an integer number (43202572).

Almost surely, 2^1665671875 is an apocalyptic number.

1665671875 is a deficient number, since it is larger than the sum of its proper divisors (753672157).

1665671875 is an frugal number, since it uses more digits than its factorization.

1665671875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 266 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 52.

The square root of 1665671875 is about 40812.6435678945. The cubic root of 1665671875 is about 1185.3951633607.

The spelling of 1665671875 in words is "one billion, six hundred sixty-five million, six hundred seventy-one thousand, eight hundred seventy-five".