809777777776 has 40 divisors (see below), whose sum is σ = 1812256691184. Its totient is φ = 346428994560.

The previous prime is 809777777771. The next prime is 809777777803. The reversal of 809777777776 is 677777777908.

It is a junction number, because it is equal to n+sod(n) for n = 809777777696 and 809777777705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809777777771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135320835 + ... + 135326818.

Almost surely, 2^809777777776 is an apocalyptic number.

It is an amenable number.

809777777776 is an abundant number, since it is smaller than the sum of its proper divisors (1002478913408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809777777776 is a wasteful number, since it uses less digits than its factorization.

809777777776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270647689 (or 270647683 counting only the distinct ones).

The product of its (nonzero) digits is 2490394032, while the sum is 79.

The spelling of 809777777776 in words is "eight hundred nine billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-six".