6401543505 has 48 divisors (see below), whose sum is σ = 11922842304. Its totient is φ = 2924423040.

The previous prime is 6401543501. The next prime is 6401543509. The reversal of 6401543505 is 5053451046.

It is an interprime number because it is at equal distance from previous prime (6401543501) and next prime (6401543509).

It is not a de Polignac number, because 6401543505 - 2² = 6401543501 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 1924774 + ... + 1928096.

It is an arithmetic number, because the mean of its divisors is an integer number (248392548).

Almost surely, 2^6401543505 is an apocalyptic number.

It is an amenable number.

6401543505 is a deficient number, since it is larger than the sum of its proper divisors (5521298799).

6401543505 is a wasteful number, since it uses less digits than its factorization.

6401543505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5966 (or 5959 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 6401543505 is about 80009.6463246776. The cubic root of 6401543505 is about 1856.7847780223.

The spelling of 6401543505 in words is "six billion, four hundred one million, five hundred forty-three thousand, five hundred five".