6778426437 has 14 divisors (see below), whose sum is σ = 10162991622. Its totient is φ = 4518950472.

The previous prime is 6778426423. The next prime is 6778426469. The reversal of 6778426437 is 7346248776.

It can be written as a sum of positive squares in only one way, i.e., 6552254916 + 226171521 = 80946^2 + 15039^2 .

It is not a de Polignac number, because 6778426437 - 2¹⁵ = 6778393669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778426537) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 4648398 + ... + 4649855.

It is an arithmetic number, because the mean of its divisors is an integer number (725927973).

Almost surely, 2^6778426437 is an apocalyptic number.

It is an amenable number.

6778426437 is a deficient number, since it is larger than the sum of its proper divisors (3384565185).

6778426437 is an frugal number, since it uses more digits than its factorization.

6778426437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9298271 (or 9298256 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 54.

The square root of 6778426437 is about 82331.1996572381. The cubic root of 6778426437 is about 1892.5308272397.

The spelling of 6778426437 in words is "six billion, seven hundred seventy-eight million, four hundred twenty-six thousand, four hundred thirty-seven".