1685665007 has 8 divisors (see below), whose sum is σ = 1818432336. Its totient is φ = 1553340672.

The previous prime is 1685665001. The next prime is 1685665019. The reversal of 1685665007 is 7005665861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1685665007 - 2¹⁶ = 1685599471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685665001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102818 + ... + 118079.

It is an arithmetic number, because the mean of its divisors is an integer number (227304042).

Almost surely, 2^1685665007 is an apocalyptic number.

1685665007 is a deficient number, since it is larger than the sum of its proper divisors (132767329).

1685665007 is a wasteful number, since it uses less digits than its factorization.

1685665007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221497.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 1685665007 is about 41056.8509143115. The cubic root of 1685665007 is about 1190.1190961942.

The spelling of 1685665007 in words is "one billion, six hundred eighty-five million, six hundred sixty-five thousand, seven".