78536051670321 has 48 divisors (see below), whose sum is σ = 138487905114624. Its totient is φ = 41864089946112.

The previous prime is 78536051670269. The next prime is 78536051670463. The reversal of 78536051670321 is 12307615063587.

78536051670321 is a `hidden beast` number, since 7 + 8 + 5 + 3 + 605 + 1 + 6 + 7 + 0 + 3 + 21 = 666.

It is not a de Polignac number, because 78536051670321 - 2⁶ = 78536051670257 is a prime.

It is a super-3 number, since 3×78536051670321³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (78536051670821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 324346441 + ... + 324588486.

It is an arithmetic number, because the mean of its divisors is an integer number (2885164689888).

Almost surely, 2^{78536051670321} is an apocalyptic number.

It is an amenable number.

78536051670321 is a deficient number, since it is larger than the sum of its proper divisors (59951853444303).

78536051670321 is a wasteful number, since it uses less digits than its factorization.

78536051670321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648935070 (or 648935067 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 78536051670321 in words is "seventy-eight trillion, five hundred thirty-six billion, fifty-one million, six hundred seventy thousand, three hundred twenty-one".