1685367601 has 2 divisors, whose sum is σ = 1685367602. Its totient is φ = 1685367600.

The previous prime is 1685367577. The next prime is 1685367611. The reversal of 1685367601 is 1067635861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1550784400 + 134583201 = 39380^2 + 11601^2 .

It is an emirp because it is prime and its reverse (1067635861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1685367601 - 2⁵ = 1685367569 is a prime.

It is not a weakly prime, because it can be changed into another prime (1685367611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842683800 + 842683801.

It is an arithmetic number, because the mean of its divisors is an integer number (842683801).

Almost surely, 2^1685367601 is an apocalyptic number.

It is an amenable number.

1685367601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685367601 is an equidigital number, since it uses as much as digits as its factorization.

1685367601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 1685367601 is about 41053.2288742311. The cubic root of 1685367601 is about 1190.0491002032.

The spelling of 1685367601 in words is "one billion, six hundred eighty-five million, three hundred sixty-seven thousand, six hundred one".