77728443515166 has 16 divisors (see below), whose sum is σ = 155459472282000. Its totient is φ = 25909050296448.

The previous prime is 77728443515143. The next prime is 77728443515167. The reversal of 77728443515166 is 66151534482777.

It is a junction number, because it is equal to n+sod(n) for n = 77728443515097 and 77728443515106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77728443515167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107327851 + ... + 108049638.

It is an arithmetic number, because the mean of its divisors is an integer number (9716217017625).

Almost surely, 2^{77728443515166} is an apocalyptic number.

77728443515166 is an abundant number, since it is smaller than the sum of its proper divisors (77731028766834).

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

77728443515166 is a wasteful number, since it uses less digits than its factorization.

77728443515166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215437643.

The product of its digits is 237081600, while the sum is 66.

The spelling of 77728443515166 in words is "seventy-seven trillion, seven hundred twenty-eight billion, four hundred forty-three million, five hundred fifteen thousand, one hundred sixty-six".