778776677877 has 32 divisors (see below), whose sum is σ = 1174900189824. Its totient is φ = 454682592000.

The previous prime is 778776677807. The next prime is 778776677909.

778776677877 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 778776677877 - 2¹² = 778776673781 is a prime.

It is a super-2 number, since 2×778776677877² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 778776677877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778776677807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3034198 + ... + 3280839.

It is an arithmetic number, because the mean of its divisors is an integer number (36715630932).

Almost surely, 2^778776677877 is an apocalyptic number.

It is an amenable number.

778776677877 is a deficient number, since it is larger than the sum of its proper divisors (396123511947).

778776677877 is a wasteful number, since it uses less digits than its factorization.

778776677877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6315189.

The product of its digits is 13282101504, while the sum is 84.

The spelling of 778776677877 in words is "seven hundred seventy-eight billion, seven hundred seventy-six million, six hundred seventy-seven thousand, eight hundred seventy-seven".