1665080659 has 4 divisors (see below), whose sum is σ = 1816451640. Its totient is φ = 1513709680.

The previous prime is 1665080633. The next prime is 1665080687. The reversal of 1665080659 is 9560805661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1665080659 - 2⁷ = 1665080531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665080629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75685474 + ... + 75685495.

It is an arithmetic number, because the mean of its divisors is an integer number (454112910).

Almost surely, 2^1665080659 is an apocalyptic number.

1665080659 is a deficient number, since it is larger than the sum of its proper divisors (151370981).

1665080659 is a wasteful number, since it uses less digits than its factorization.

1665080659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151370980.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 1665080659 is about 40805.3998755067. The cubic root of 1665080659 is about 1185.2548981358.

The spelling of 1665080659 in words is "one billion, six hundred sixty-five million, eighty thousand, six hundred fifty-nine".