1689639066 has 24 divisors (see below), whose sum is σ = 3778978944. Its totient is φ = 545044680.

The previous prime is 1689639059. The next prime is 1689639071. The reversal of 1689639066 is 6609369861.

1689639066 is a `hidden beast` number, since 168 + 96 + 390 + 6 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1513456 + ... + 1514571.

It is an arithmetic number, because the mean of its divisors is an integer number (157457456).

Almost surely, 2^1689639066 is an apocalyptic number.

1689639066 is an abundant number, since it is smaller than the sum of its proper divisors (2089339878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1689639066 is a wasteful number, since it uses less digits than its factorization.

1689639066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028066 (or 3028063 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 1689639066 is about 41105.2194496027. The cubic root of 1689639066 is about 1191.0536218500.

The spelling of 1689639066 in words is "one billion, six hundred eighty-nine million, six hundred thirty-nine thousand, sixty-six".