6778761863 has 4 divisors (see below), whose sum is σ = 6816213768. Its totient is φ = 6741309960.

The previous prime is 6778761817. The next prime is 6778761877. The reversal of 6778761863 is 3681678776.

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

It is a cyclic number.

It is not a de Polignac number, because 6778761863 - 2⁸ = 6778761607 is a prime.

It is a super-2 number, since 2×6778761863² = 91903224790526461538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778701863) 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, 18725681 + ... + 18726042.

It is an arithmetic number, because the mean of its divisors is an integer number (1704053442).

Almost surely, 2^6778761863 is an apocalyptic number.

6778761863 is a deficient number, since it is larger than the sum of its proper divisors (37451905).

6778761863 is a wasteful number, since it uses less digits than its factorization.

6778761863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37451904.

The product of its digits is 14224896, while the sum is 59.

The square root of 6778761863 is about 82333.2366848286. The cubic root of 6778761863 is about 1892.5620436083.

The spelling of 6778761863 in words is "six billion, seven hundred seventy-eight million, seven hundred sixty-one thousand, eight hundred sixty-three".