1665387875 has 8 divisors (see below), whose sum is σ = 2078404224. Its totient is φ = 1332310200.

The previous prime is 1665387863. The next prime is 1665387883. The reversal of 1665387875 is 5787835661.

It is not a de Polignac number, because 1665387875 - 2⁶ = 1665387811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1665387875.

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, 6661427 + ... + 6661676.

It is an arithmetic number, because the mean of its divisors is an integer number (259800528).

Almost surely, 2^1665387875 is an apocalyptic number.

1665387875 is a deficient number, since it is larger than the sum of its proper divisors (413016349).

1665387875 is an equidigital number, since it uses as much as digits as its factorization.

1665387875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13323118 (or 13323108 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 56.

The square root of 1665387875 is about 40809.1641056271. The cubic root of 1665387875 is about 1185.3277888743.

The spelling of 1665387875 in words is "one billion, six hundred sixty-five million, three hundred eighty-seven thousand, eight hundred seventy-five".