1660665479 has 8 divisors (see below), whose sum is σ = 1812165888. Its totient is φ = 1509253560.

The previous prime is 1660665473. The next prime is 1660665491. The reversal of 1660665479 is 9745660661.

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

It is a cyclic number.

It is not a de Polignac number, because 1660665479 - 2²⁴ = 1643888263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660665473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20744 + ... + 61250.

It is an arithmetic number, because the mean of its divisors is an integer number (226520736).

Almost surely, 2^1660665479 is an apocalyptic number.

1660665479 is a deficient number, since it is larger than the sum of its proper divisors (151500409).

1660665479 is a wasteful number, since it uses less digits than its factorization.

1660665479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44245.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 1660665479 is about 40751.2635264233. The cubic root of 1660665479 is about 1184.2063511384.

The spelling of 1660665479 in words is "one billion, six hundred sixty million, six hundred sixty-five thousand, four hundred seventy-nine".