1660802489 has 4 divisors (see below), whose sum is σ = 1677246180. Its totient is φ = 1644358800.

The previous prime is 1660802477. The next prime is 1660802501. The reversal of 1660802489 is 9842080661.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1660802477) and next prime (1660802501).

It can be written as a sum of positive squares in 2 ways, for example, as 1390693264 + 270109225 = 37292^2 + 16435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660802489 - 2²⁰ = 1659753913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660802789) 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, 8221694 + ... + 8221895.

It is an arithmetic number, because the mean of its divisors is an integer number (419311545).

Almost surely, 2^1660802489 is an apocalyptic number.

It is an amenable number.

1660802489 is a deficient number, since it is larger than the sum of its proper divisors (16443691).

1660802489 is a wasteful number, since it uses less digits than its factorization.

1660802489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16443690.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 1660802489 is about 40752.9445439222. The cubic root of 1660802489 is about 1184.2389171292.

The spelling of 1660802489 in words is "one billion, six hundred sixty million, eight hundred two thousand, four hundred eighty-nine".