1665125673 has 16 divisors (see below), whose sum is σ = 2368719936. Its totient is φ = 1036805120.

The previous prime is 1665125659. The next prime is 1665125681. The reversal of 1665125673 is 3765215661.

It is a cyclic number.

It is not a de Polignac number, because 1665125673 - 2²⁹ = 1128254761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665125603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117936 + ... + 131297.

It is an arithmetic number, because the mean of its divisors is an integer number (148044996).

Almost surely, 2^1665125673 is an apocalyptic number.

It is an amenable number.

1665125673 is a deficient number, since it is larger than the sum of its proper divisors (703594263).

1665125673 is a wasteful number, since it uses less digits than its factorization.

1665125673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249384.

The product of its digits is 226800, while the sum is 42.

The square root of 1665125673 is about 40805.9514409357. The cubic root of 1665125673 is about 1185.2655788162.

It can be divided in two parts, 16651 and 25673, that added together give a palindrome (42324).

The spelling of 1665125673 in words is "one billion, six hundred sixty-five million, one hundred twenty-five thousand, six hundred seventy-three".