1673865665 has 8 divisors (see below), whose sum is σ = 2011583808. Its totient is φ = 1337129200.

The previous prime is 1673865643. The next prime is 1673865671. The reversal of 1673865665 is 5665683761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1673865665 - 2⁸ = 1673865409 is a prime.

It is a Duffinian 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, 241661 + ... + 248490.

It is an arithmetic number, because the mean of its divisors is an integer number (251447976).

Almost surely, 2^1673865665 is an apocalyptic number.

It is an amenable number.

1673865665 is a deficient number, since it is larger than the sum of its proper divisors (337718143).

1673865665 is an equidigital number, since it uses as much as digits as its factorization.

1673865665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490839.

The product of its digits is 5443200, while the sum is 53.

The square root of 1673865665 is about 40912.9034046717. The cubic root of 1673865665 is about 1187.3357208018.

The spelling of 1673865665 in words is "one billion, six hundred seventy-three million, eight hundred sixty-five thousand, six hundred sixty-five".