1643232552 has 128 divisors (see below), whose sum is σ = 4505424000. Its totient is φ = 496419840.

The previous prime is 1643232551. The next prime is 1643232559. The reversal of 1643232552 is 2552323461.

It is a happy number.

1643232552 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1643232551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7175574 + ... + 7175802.

It is an arithmetic number, because the mean of its divisors is an integer number (35198625).

Almost surely, 2^1643232552 is an apocalyptic number.

1643232552 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 1643232552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2252712000).

1643232552 is an abundant number, since it is smaller than the sum of its proper divisors (2862191448).

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

1643232552 is a wasteful number, since it uses less digits than its factorization.

1643232552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 567 counting only the distinct ones).

The product of its digits is 43200, while the sum is 33.

The square root of 1643232552 is about 40536.8049061590. The cubic root of 1643232552 is about 1180.0480091546.

Subtracting 1643232552 from its reverse (2552323461), we obtain a palindrome (909090909).

It can be divided in two parts, 16432 and 32552, that added together give a palindrome (48984).

The spelling of 1643232552 in words is "one billion, six hundred forty-three million, two hundred thirty-two thousand, five hundred fifty-two".