1685780699 has 12 divisors (see below), whose sum is σ = 1795542336. Its totient is φ = 1582035312.

The previous prime is 1685780693. The next prime is 1685780737. The reversal of 1685780699 is 9960875861.

It is a de Polignac number, because none of the positive numbers 2^k-1685780699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685780693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2027 + ... + 58100.

It is an arithmetic number, because the mean of its divisors is an integer number (149628528).

Almost surely, 2^1685780699 is an apocalyptic number.

1685780699 is a deficient number, since it is larger than the sum of its proper divisors (109761637).

1685780699 is an equidigital number, since it uses as much as digits as its factorization.

1685780699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60226 (or 60203 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 1685780699 is about 41058.2598145611. The cubic root of 1685780699 is about 1190.1463226613.

The spelling of 1685780699 in words is "one billion, six hundred eighty-five million, seven hundred eighty thousand, six hundred ninety-nine".