6543881426 has 4 divisors (see below), whose sum is σ = 9815822142. Its totient is φ = 3271940712.

The previous prime is 6543881411. The next prime is 6543881437. The reversal of 6543881426 is 6241883456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6460140625 + 83740801 = 80375^2 + 9151^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1635970355 + ... + 1635970358.

Almost surely, 2^6543881426 is an apocalyptic number.

6543881426 is a deficient number, since it is larger than the sum of its proper divisors (3271940716).

6543881426 is a wasteful number, since it uses less digits than its factorization.

6543881426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271940715.

The product of its digits is 1105920, while the sum is 47.

The square root of 6543881426 is about 80894.2607729374. The cubic root of 6543881426 is about 1870.4458530630.

The spelling of 6543881426 in words is "six billion, five hundred forty-three million, eight hundred eighty-one thousand, four hundred twenty-six".