1685005204079 has 2 divisors, whose sum is σ = 1685005204080. Its totient is φ = 1685005204078.

The previous prime is 1685005204039. The next prime is 1685005204093. The reversal of 1685005204079 is 9704025005861.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685005204079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685005204039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842502602039 + 842502602040.

It is an arithmetic number, because the mean of its divisors is an integer number (842502602040).

Almost surely, 2^{1685005204079} is an apocalyptic number.

1685005204079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685005204079 is an equidigital number, since it uses as much as digits as its factorization.

1685005204079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 1685005204079 in words is "one trillion, six hundred eighty-five billion, five million, two hundred four thousand, seventy-nine".