6408778551 has 24 divisors (see below), whose sum is σ = 10076329584. Its totient is φ = 3611986560.

The previous prime is 6408778529. The next prime is 6408778561. The reversal of 6408778551 is 1558778046.

It is a happy number.

It is not a de Polignac number, because 6408778551 - 2⁶ = 6408778487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6408778494 and 6408778503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6408778561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 287880 + ... + 309341.

It is an arithmetic number, because the mean of its divisors is an integer number (419847066).

Almost surely, 2^6408778551 is an apocalyptic number.

6408778551 is a deficient number, since it is larger than the sum of its proper divisors (3667551033).

6408778551 is a wasteful number, since it uses less digits than its factorization.

6408778551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597311 (or 597304 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 51.

The square root of 6408778551 is about 80054.8471424435. The cubic root of 6408778551 is about 1857.4840294567.

The spelling of 6408778551 in words is "six billion, four hundred eight million, seven hundred seventy-eight thousand, five hundred fifty-one".