77778632318 has 16 divisors (see below), whose sum is σ = 121860719136. Its totient is φ = 37161732960.

The previous prime is 77778632317. The next prime is 77778632383. The reversal of 77778632318 is 81323687777.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77778632317) 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, 787973 + ... + 881168.

It is an arithmetic number, because the mean of its divisors is an integer number (7616294946).

Almost surely, 2^77778632318 is an apocalyptic number.

77778632318 is a deficient number, since it is larger than the sum of its proper divisors (44082086818).

77778632318 is a wasteful number, since it uses less digits than its factorization.

77778632318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670179.

The product of its digits is 16595712, while the sum is 59.

The spelling of 77778632318 in words is "seventy-seven billion, seven hundred seventy-eight million, six hundred thirty-two thousand, three hundred eighteen".