677778722779 has 4 divisors (see below), whose sum is σ = 677792779776. Its totient is φ = 677764665784.

The previous prime is 677778722771. The next prime is 677778722791. The reversal of 677778722779 is 977227877776.

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 677778722779 - 2³ = 677778722771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (677778722771) 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, 6955924 + ... + 7052689.

It is an arithmetic number, because the mean of its divisors is an integer number (169448194944).

Almost surely, 2^677778722779 is an apocalyptic number.

677778722779 is a deficient number, since it is larger than the sum of its proper divisors (14056997).

677778722779 is a wasteful number, since it uses less digits than its factorization.

677778722779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14056996.

The product of its digits is 1423082304, while the sum is 76.

The spelling of 677778722779 in words is "six hundred seventy-seven billion, seven hundred seventy-eight million, seven hundred twenty-two thousand, seven hundred seventy-nine".