6777578513 has 18 divisors (see below), whose sum is σ = 7370694198. Its totient is φ = 6210535680.

The previous prime is 6777578503. The next prime is 6777578551. The reversal of 6777578513 is 3158757776.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3794704 + 6773783809 = 1948^2 + 82303^2 .

It is not a de Polignac number, because 6777578513 - 2⁴ = 6777578497 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6777578503) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13916756 + ... + 13917242.

It is an arithmetic number, because the mean of its divisors is an integer number (409483011).

Almost surely, 2^6777578513 is an apocalyptic number.

It is an amenable number.

6777578513 is a deficient number, since it is larger than the sum of its proper divisors (593115685).

6777578513 is an frugal number, since it uses more digits than its factorization.

6777578513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073 (or 545 counting only the distinct ones).

The product of its digits is 8643600, while the sum is 56.

The square root of 6777578513 is about 82326.0500267078. The cubic root of 6777578513 is about 1892.4519107321.

The spelling of 6777578513 in words is "six billion, seven hundred seventy-seven million, five hundred seventy-eight thousand, five hundred thirteen".