778849948877 has 24 divisors (see below), whose sum is σ = 1053650803968. Its totient is φ = 560211743520.

The previous prime is 778849948873. The next prime is 778849948879.

778849948877 is nontrivially palindromic in base 10.

778849948877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 778849948877 - 2² = 778849948873 is a prime.

It is a super-2 number, since 2×778849948877² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778849948871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35355893 + ... + 35377914.

It is an arithmetic number, because the mean of its divisors is an integer number (43902116832).

Almost surely, 2^778849948877 is an apocalyptic number.

778849948877 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

778849948877 is a deficient number, since it is larger than the sum of its proper divisors (274800855091).

778849948877 is a wasteful number, since it uses less digits than its factorization.

778849948877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70733849 (or 70733838 counting only the distinct ones).

The product of its digits is 12745506816, while the sum is 86.

The spelling of 778849948877 in words is "seven hundred seventy-eight billion, eight hundred forty-nine million, nine hundred forty-eight thousand, eight hundred seventy-seven".