78506864005121 has 8 divisors (see below), whose sum is σ = 79464989712864. Its totient is φ = 77549030199360.

The previous prime is 78506864005057. The next prime is 78506864005201. The reversal of 78506864005121 is 12150046860587.

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 78506864005121 - 2⁶ = 78506864005057 is a prime.

It is a super-3 number, since 3×78506864005121³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78506864055121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72434291 + ... + 73510136.

It is an arithmetic number, because the mean of its divisors is an integer number (9933123714108).

Almost surely, 2^{78506864005121} is an apocalyptic number.

It is an amenable number.

78506864005121 is a deficient number, since it is larger than the sum of its proper divisors (958125707743).

78506864005121 is a wasteful number, since it uses less digits than its factorization.

78506864005121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145950991.

The product of its (nonzero) digits is 3225600, while the sum is 53.

The spelling of 78506864005121 in words is "seventy-eight trillion, five hundred six billion, eight hundred sixty-four million, five thousand, one hundred twenty-one".