78713613321 has 32 divisors (see below), whose sum is σ = 124212802560. Its totient is φ = 43403822784.

The previous prime is 78713613317. The next prime is 78713613323. The reversal of 78713613321 is 12331631787.

It is not a de Polignac number, because 78713613321 - 2² = 78713613317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78713613323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 450166 + ... + 600063.

It is an arithmetic number, because the mean of its divisors is an integer number (3881650080).

Almost surely, 2^78713613321 is an apocalyptic number.

It is an amenable number.

78713613321 is a deficient number, since it is larger than the sum of its proper divisors (45499189239).

78713613321 is a wasteful number, since it uses less digits than its factorization.

78713613321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050365.

The product of its digits is 127008, while the sum is 42.

The spelling of 78713613321 in words is "seventy-eight billion, seven hundred thirteen million, six hundred thirteen thousand, three hundred twenty-one".