6543043551 has 24 divisors (see below), whose sum is σ = 10642844160. Its totient is φ = 3837560400.

The previous prime is 6543043541. The next prime is 6543043579. The reversal of 6543043551 is 1553403456.

6543043551 is a `hidden beast` number, since 65 + 4 + 3 + 0 + 43 + 551 = 666.

It is not a de Polignac number, because 6543043551 - 2¹⁷ = 6542912479 is a prime.

It is a super-2 number, since 2×6543043551² = 85622837820565379202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543043511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1062921 + ... + 1069058.

It is an arithmetic number, because the mean of its divisors is an integer number (443451840).

Almost surely, 2^6543043551 is an apocalyptic number.

6543043551 is a deficient number, since it is larger than the sum of its proper divisors (4099800609).

6543043551 is a wasteful number, since it uses less digits than its factorization.

6543043551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132027 (or 2132024 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The square root of 6543043551 is about 80889.0817786925. The cubic root of 6543043551 is about 1870.3660193675.

The spelling of 6543043551 in words is "six billion, five hundred forty-three million, forty-three thousand, five hundred fifty-one".