1685463551999 has 2 divisors, whose sum is σ = 1685463552000. Its totient is φ = 1685463551998.

The previous prime is 1685463551953. The next prime is 1685463552011. The reversal of 1685463551999 is 9991553645861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1685463551999 - 2²⁴ = 1685446774783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685463551599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842731775999 + 842731776000.

It is an arithmetic number, because the mean of its divisors is an integer number (842731776000).

Almost surely, 2^{1685463551999} is an apocalyptic number.

1685463551999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685463551999 is an equidigital number, since it uses as much as digits as its factorization.

1685463551999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928000, while the sum is 71.

The spelling of 1685463551999 in words is "one trillion, six hundred eighty-five billion, four hundred sixty-three million, five hundred fifty-one thousand, nine hundred ninety-nine".