1665928879 has 2 divisors, whose sum is σ = 1665928880. Its totient is φ = 1665928878.

The previous prime is 1665928841. The next prime is 1665928907. The reversal of 1665928879 is 9788295661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1665928879 - 2²¹ = 1663831727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665928819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832964439 + 832964440.

It is an arithmetic number, because the mean of its divisors is an integer number (832964440).

Almost surely, 2^1665928879 is an apocalyptic number.

1665928879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665928879 is an equidigital number, since it uses as much as digits as its factorization.

1665928879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 61.

The square root of 1665928879 is about 40815.7920295564. The cubic root of 1665928879 is about 1185.4561268745.

The spelling of 1665928879 in words is "one billion, six hundred sixty-five million, nine hundred twenty-eight thousand, eight hundred seventy-nine".