1663551252 has 144 divisors (see below), whose sum is σ = 4938058944. Its totient is φ = 466560000.

The previous prime is 1663551223. The next prime is 1663551287. The reversal of 1663551252 is 2521553661.

1663551252 is a `hidden beast` number, since 1 + 6 + 635 + 5 + 12 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 408627 + ... + 412677.

It is an arithmetic number, because the mean of its divisors is an integer number (34292076).

Almost surely, 2^1663551252 is an apocalyptic number.

1663551252 is a gapful number since it is divisible by the number (12) 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 1663551252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2469029472).

1663551252 is an abundant number, since it is smaller than the sum of its proper divisors (3274507692).

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

1663551252 is a wasteful number, since it uses less digits than its factorization.

1663551252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150 (or 4145 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 1663551252 is about 40786.6553176404. The cubic root of 1663551252 is about 1184.8918942132.

The spelling of 1663551252 in words is "one billion, six hundred sixty-three million, five hundred fifty-one thousand, two hundred fifty-two".