78866752121 has 8 divisors (see below), whose sum is σ = 83512204704. Its totient is φ = 74221992000.

The previous prime is 78866752093. The next prime is 78866752123. The reversal of 78866752121 is 12125766887.

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

It is a cyclic number.

It is not a de Polignac number, because 78866752121 - 2²⁶ = 78799643257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78866752123) 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, 71246 + ... + 403496.

It is an arithmetic number, because the mean of its divisors is an integer number (10439025588).

Almost surely, 2^78866752121 is an apocalyptic number.

It is an amenable number.

78866752121 is a deficient number, since it is larger than the sum of its proper divisors (4645452583).

78866752121 is a wasteful number, since it uses less digits than its factorization.

78866752121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346231.

The product of its digits is 2257920, while the sum is 53.

The spelling of 78866752121 in words is "seventy-eight billion, eight hundred sixty-six million, seven hundred fifty-two thousand, one hundred twenty-one".