6401543500 has 96 divisors (see below), whose sum is σ = 15280259904. Its totient is φ = 2323520000.

The previous prime is 6401543497. The next prime is 6401543501. The reversal of 6401543500 is 53451046.

It is not an unprimeable number, because it can be changed into a prime (6401543501) 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, 5834952 + ... + 5836048.

It is an arithmetic number, because the mean of its divisors is an integer number (159169374).

Almost surely, 2^6401543500 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 6401543500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7640129952).

6401543500 is an abundant number, since it is smaller than the sum of its proper divisors (8878716404).

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

6401543500 is a wasteful number, since it uses less digits than its factorization.

6401543500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188 (or 2176 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 6401543500 is about 80009.6462934314. The cubic root of 6401543500 is about 1856.7847775389.

Adding to 6401543500 its reverse (53451046), we get a palindrome (6454994546).

The spelling of 6401543500 in words is "six billion, four hundred one million, five hundred forty-three thousand, five hundred".