1663523568 has 240 divisors, whose sum is σ = 5809905920. Its totient is φ = 450137088.

The previous prime is 1663523567. The next prime is 1663523569. The reversal of 1663523568 is 8653253661.

1663523568 is a `hidden beast` number, since 1 + 6 + 63 + 5 + 23 + 568 = 666.

1663523568 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1663523567) and next prime (1663523569).

It is a super-2 number, since 2×1663523568² = 5534621322582901248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663523567) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 515496 + ... + 518712.

Almost surely, 2^1663523568 is an apocalyptic number.

1663523568 is a gapful number since it is divisible by the number (18) 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 1663523568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2904952960).

1663523568 is an abundant number, since it is smaller than the sum of its proper divisors (4146382352).

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

1663523568 is a wasteful number, since it uses less digits than its factorization.

1663523568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266 (or 3248 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 1663523568 is about 40786.3159405210. The cubic root of 1663523568 is about 1184.8853213811.

The spelling of 1663523568 in words is "one billion, six hundred sixty-three million, five hundred twenty-three thousand, five hundred sixty-eight".