77331666078 has 48 divisors (see below), whose sum is σ = 177552226800. Its totient is φ = 24241183488.

The previous prime is 77331666023. The next prime is 77331666101. The reversal of 77331666078 is 87066613377.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 276373 + ... + 480671.

It is an arithmetic number, because the mean of its divisors is an integer number (3699004725).

Almost surely, 2^77331666078 is an apocalyptic number.

77331666078 is an abundant number, since it is smaller than the sum of its proper divisors (100220560722).

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

77331666078 is a wasteful number, since it uses less digits than its factorization.

77331666078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205561 (or 205558 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 54.

The spelling of 77331666078 in words is "seventy-seven billion, three hundred thirty-one million, six hundred sixty-six thousand, seventy-eight".