6648863839 has 4 divisors (see below), whose sum is σ = 6707703456. Its totient is φ = 6590024224.

The previous prime is 6648863821. The next prime is 6648863869. The reversal of 6648863839 is 9383688466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9383688466 = 2 ⋅4691844233.

It is a cyclic number.

It is not a de Polignac number, because 6648863839 - 2¹⁵ = 6648831071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6648863869) 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, 29419639 + ... + 29419864.

It is an arithmetic number, because the mean of its divisors is an integer number (1676925864).

Almost surely, 2^6648863839 is an apocalyptic number.

6648863839 is a deficient number, since it is larger than the sum of its proper divisors (58839617).

6648863839 is a wasteful number, since it uses less digits than its factorization.

6648863839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58839616.

The product of its digits is 35831808, while the sum is 61.

The square root of 6648863839 is about 81540.5656038760. The cubic root of 6648863839 is about 1880.3952540577.

The spelling of 6648863839 in words is "six billion, six hundred forty-eight million, eight hundred sixty-three thousand, eight hundred thirty-nine".