1691618016 has 192 divisors, whose sum is σ = 5029516800. Its totient is φ = 493363200.

The previous prime is 1691617981. The next prime is 1691618039. The reversal of 1691618016 is 6108161961.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3853125 + ... + 3853563.

It is an arithmetic number, because the mean of its divisors is an integer number (26195400).

Almost surely, 2^1691618016 is an apocalyptic number.

1691618016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691618016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2514758400).

1691618016 is an abundant number, since it is smaller than the sum of its proper divisors (3337898784).

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

1691618016 is a wasteful number, since it uses less digits than its factorization.

1691618016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 1691618016 is about 41129.2841659079. The cubic root of 1691618016 is about 1191.5184382721.

Adding to 1691618016 its reverse (6108161961), we get a palindrome (7799779977).

The spelling of 1691618016 in words is "one billion, six hundred ninety-one million, six hundred eighteen thousand, sixteen".