6778629549 has 6 divisors (see below), whose sum is σ = 9791353806. Its totient is φ = 4519086360.

The previous prime is 6778629509. The next prime is 6778629617. The reversal of 6778629549 is 9459268776.

6778629549 is a `hidden beast` number, since 6 + 7 + 7 + 86 + 2 + 9 + 549 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6771644100 + 6985449 = 82290^2 + 2643^2 .

It is not a de Polignac number, because 6778629549 - 2⁹ = 6778629037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778629509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 376590522 + ... + 376590539.

It is an arithmetic number, because the mean of its divisors is an integer number (1631892301).

Almost surely, 2^6778629549 is an apocalyptic number.

It is an amenable number.

6778629549 is a deficient number, since it is larger than the sum of its proper divisors (3012724257).

6778629549 is a wasteful number, since it uses less digits than its factorization.

6778629549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753181067 (or 753181064 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The square root of 6778629549 is about 82332.4331536485. The cubic root of 6778629549 is about 1892.5497299495.

The spelling of 6778629549 in words is "six billion, seven hundred seventy-eight million, six hundred twenty-nine thousand, five hundred forty-nine".