1689658866 has 240 divisors, whose sum is σ = 4916181600. Its totient is φ = 429795072.

The previous prime is 1689658853. The next prime is 1689658877. The reversal of 1689658866 is 6688569861.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2563645 + ... + 2564303.

It is an arithmetic number, because the mean of its divisors is an integer number (20484090).

Almost surely, 2^1689658866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1689658866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2458090800).

1689658866 is an abundant number, since it is smaller than the sum of its proper divisors (3226522734).

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

1689658866 is a wasteful number, since it uses less digits than its factorization.

1689658866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723 (or 707 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The square root of 1689658866 is about 41105.4602942237. The cubic root of 1689658866 is about 1191.0582742775.

The spelling of 1689658866 in words is "one billion, six hundred eighty-nine million, six hundred fifty-eight thousand, eight hundred sixty-six".