1660565665 has 32 divisors (see below), whose sum is σ = 2258098560. Its totient is φ = 1161216000.

The previous prime is 1660565659. The next prime is 1660565681. The reversal of 1660565665 is 5665650661.

It is not a de Polignac number, because 1660565665 - 2³ = 1660565657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 407890 + ... + 411940.

It is an arithmetic number, because the mean of its divisors is an integer number (70565580).

Almost surely, 2^1660565665 is an apocalyptic number.

It is an amenable number.

1660565665 is a deficient number, since it is larger than the sum of its proper divisors (597532895).

1660565665 is a wasteful number, since it uses less digits than its factorization.

1660565665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353.

The product of its (nonzero) digits is 972000, while the sum is 46.

The square root of 1660565665 is about 40750.0388343373. The cubic root of 1660565665 is about 1184.1826251597.

The spelling of 1660565665 in words is "one billion, six hundred sixty million, five hundred sixty-five thousand, six hundred sixty-five".