77121013696 has 56 divisors (see below), whose sum is σ = 160205220864. Its totient is φ = 36765146880.

The previous prime is 77121013663. The next prime is 77121013703. The reversal of 77121013696 is 69631012177.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373561 + ... + 542023.

Almost surely, 2^77121013696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77121013696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80102610432).

77121013696 is an abundant number, since it is smaller than the sum of its proper divisors (83084207168).

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

77121013696 is a wasteful number, since it uses less digits than its factorization.

77121013696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168809 (or 168799 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The spelling of 77121013696 in words is "seventy-seven billion, one hundred twenty-one million, thirteen thousand, six hundred ninety-six".