6489778331 has 4 divisors (see below), whose sum is σ = 6554033664. Its totient is φ = 6425523000.

The previous prime is 6489778319. The next prime is 6489778363. The reversal of 6489778331 is 1338779846.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6489778331 is a prime.

It is a super-2 number, since 2×6489778331² = 84234445571034291122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6489778391) 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, 32127515 + ... + 32127716.

It is an arithmetic number, because the mean of its divisors is an integer number (1638508416).

Almost surely, 2^6489778331 is an apocalyptic number.

6489778331 is a deficient number, since it is larger than the sum of its proper divisors (64255333).

6489778331 is a wasteful number, since it uses less digits than its factorization.

6489778331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64255332.

The product of its digits is 6096384, while the sum is 56.

The square root of 6489778331 is about 80559.1604412558. The cubic root of 6489778331 is about 1865.2767960968.

The spelling of 6489778331 in words is "six billion, four hundred eighty-nine million, seven hundred seventy-eight thousand, three hundred thirty-one".