678421655776 has 12 divisors (see below), whose sum is σ = 1335642634872. Its totient is φ = 339210827872.

The previous prime is 678421655759. The next prime is 678421655801. The reversal of 678421655776 is 677556124876.

678421655776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600338340 + ... + 10600338403.

It is an arithmetic number, because the mean of its divisors is an integer number (111303552906).

Almost surely, 2^678421655776 is an apocalyptic number.

It is an amenable number.

678421655776 is a deficient number, since it is larger than the sum of its proper divisors (657220979096).

678421655776 is a wasteful number, since it uses less digits than its factorization.

678421655776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21200676753 (or 21200676745 counting only the distinct ones).

The product of its digits is 118540800, while the sum is 64.

The spelling of 678421655776 in words is "six hundred seventy-eight billion, four hundred twenty-one million, six hundred fifty-five thousand, seven hundred seventy-six".