1686687005 has 8 divisors (see below), whose sum is σ = 2052532224. Its totient is φ = 1330344400.

The previous prime is 1686686993. The next prime is 1686687031. The reversal of 1686687005 is 5007866861.

1686687005 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1686687005 - 2¹⁰ = 1686685981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2375261 + ... + 2375970.

It is an arithmetic number, because the mean of its divisors is an integer number (256566528).

Almost surely, 2^1686687005 is an apocalyptic number.

It is an amenable number.

1686687005 is a deficient number, since it is larger than the sum of its proper divisors (365845219).

1686687005 is an equidigital number, since it uses as much as digits as its factorization.

1686687005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4751307.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 1686687005 is about 41069.2951607402. The cubic root of 1686687005 is about 1190.3595658021.

The spelling of 1686687005 in words is "one billion, six hundred eighty-six million, six hundred eighty-seven thousand, five".