6778684156 has 12 divisors (see below), whose sum is σ = 11874013200. Its totient is φ = 3386108960.

The previous prime is 6778684139. The next prime is 6778684219. The reversal of 6778684156 is 6514868776.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6778684156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 803560 + ... + 811951.

It is an arithmetic number, because the mean of its divisors is an integer number (989501100).

Almost surely, 2^6778684156 is an apocalyptic number.

It is an amenable number.

6778684156 is a deficient number, since it is larger than the sum of its proper divisors (5095329044).

6778684156 is a wasteful number, since it uses less digits than its factorization.

6778684156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616564 (or 1616562 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 58.

The square root of 6778684156 is about 82332.7647780639. The cubic root of 6778684156 is about 1892.5548119101.

The spelling of 6778684156 in words is "six billion, seven hundred seventy-eight million, six hundred eighty-four thousand, one hundred fifty-six".