1664056777879 has 2 divisors, whose sum is σ = 1664056777880. Its totient is φ = 1664056777878.

The previous prime is 1664056777843. The next prime is 1664056777937. The reversal of 1664056777879 is 9787776504661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1664056777879 - 2⁷ = 1664056777751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664056777679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832028388939 + 832028388940.

It is an arithmetic number, because the mean of its divisors is an integer number (832028388940).

Almost surely, 2^{1664056777879} is an apocalyptic number.

1664056777879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664056777879 is an equidigital number, since it uses as much as digits as its factorization.

1664056777879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746807040, while the sum is 73.

The spelling of 1664056777879 in words is "one trillion, six hundred sixty-four billion, fifty-six million, seven hundred seventy-seven thousand, eight hundred seventy-nine".