78659668257 has 8 divisors (see below), whose sum is σ = 105042669984. Its totient is φ = 52358222688.

The previous prime is 78659668247. The next prime is 78659668277. The reversal of 78659668257 is 75286695687.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78659668257 - 2⁶ = 78659668193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78659668191 and 78659668200.

It is not an unprimeable number, because it can be changed into a prime (78659668247) 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, 20386788 + ... + 20390645.

It is an arithmetic number, because the mean of its divisors is an integer number (13130333748).

Almost surely, 2^78659668257 is an apocalyptic number.

It is an amenable number.

78659668257 is a deficient number, since it is larger than the sum of its proper divisors (26383001727).

78659668257 is a wasteful number, since it uses less digits than its factorization.

78659668257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40778079.

The product of its digits is 304819200, while the sum is 69.

The spelling of 78659668257 in words is "seventy-eight billion, six hundred fifty-nine million, six hundred sixty-eight thousand, two hundred fifty-seven".