1686398616 has 224 divisors, whose sum is σ = 5485111200. Its totient is φ = 475891200.

The previous prime is 1686398563. The next prime is 1686398669. The reversal of 1686398616 is 6168936861.

1686398616 is a `hidden beast` number, since 16 + 8 + 6 + 3 + 9 + 8 + 616 = 666.

It is an interprime number because it is at equal distance from previous prime (1686398563) and next prime (1686398669).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 4123020 + ... + 4123428.

Almost surely, 2^1686398616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686398616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2742555600).

1686398616 is an abundant number, since it is smaller than the sum of its proper divisors (3798712584).

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

1686398616 is a wasteful number, since it uses less digits than its factorization.

1686398616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 522 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 1686398616 is about 41065.7840056658. The cubic root of 1686398616 is about 1190.2917195507.

The spelling of 1686398616 in words is "one billion, six hundred eighty-six million, three hundred ninety-eight thousand, six hundred sixteen".