1689137685 has 64 divisors (see below), whose sum is σ = 3049512960. Its totient is φ = 887008320.

The previous prime is 1689137627. The next prime is 1689137693. The reversal of 1689137685 is 5867319861.

It is not a de Polignac number, because 1689137685 - 2¹⁵ = 1689104917 is a prime.

It is a super-2 number, since 2×1689137685² = 5706372237774318450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4602372 + ... + 4602738.

It is an arithmetic number, because the mean of its divisors is an integer number (47648640).

Almost surely, 2^1689137685 is an apocalyptic number.

1689137685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1689137685 is a deficient number, since it is larger than the sum of its proper divisors (1360375275).

1689137685 is a wasteful number, since it uses less digits than its factorization.

1689137685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 809 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 1689137685 is about 41099.1202460588. The cubic root of 1689137685 is about 1190.9357996978.

The spelling of 1689137685 in words is "one billion, six hundred eighty-nine million, one hundred thirty-seven thousand, six hundred eighty-five".