6548639851 has 4 divisors (see below), whose sum is σ = 7052381392. Its totient is φ = 6044898312.

The previous prime is 6548639849. The next prime is 6548639917. The reversal of 6548639851 is 1589368456.

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

It is a cyclic number.

It is not a de Polignac number, because 6548639851 - 2¹ = 6548639849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6548639792 and 6548639801.

It is not an unprimeable number, because it can be changed into a prime (6548639821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251870751 + ... + 251870776.

It is an arithmetic number, because the mean of its divisors is an integer number (1763095348).

Almost surely, 2^6548639851 is an apocalyptic number.

6548639851 is a deficient number, since it is larger than the sum of its proper divisors (503741541).

6548639851 is a wasteful number, since it uses less digits than its factorization.

6548639851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503741540.

The product of its digits is 6220800, while the sum is 55.

The square root of 6548639851 is about 80923.6668163276. Note that the first 3 decimals coincide. The cubic root of 6548639851 is about 1870.8991120836.

The spelling of 6548639851 in words is "six billion, five hundred forty-eight million, six hundred thirty-nine thousand, eight hundred fifty-one".