1668501685 has 16 divisors (see below), whose sum is σ = 2073899520. Its totient is φ = 1287299520.

The previous prime is 1668501677. The next prime is 1668501721. The reversal of 1668501685 is 5861058661.

It is not a de Polignac number, because 1668501685 - 2³ = 1668501677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27046 + ... + 63784.

It is an arithmetic number, because the mean of its divisors is an integer number (129618720).

Almost surely, 2^1668501685 is an apocalyptic number.

It is an amenable number.

1668501685 is a deficient number, since it is larger than the sum of its proper divisors (405397835).

1668501685 is a wasteful number, since it uses less digits than its factorization.

1668501685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37068.

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 1668501685 is about 40847.2971566051. The cubic root of 1668501685 is about 1186.0660728612.

The spelling of 1668501685 in words is "one billion, six hundred sixty-eight million, five hundred one thousand, six hundred eighty-five".