78855887458251 has 24 divisors (see below), whose sum is σ = 115624012327824. Its totient is φ = 51776539848000.

The previous prime is 78855887458171. The next prime is 78855887458267. The reversal of 78855887458251 is 15285478855887.

78855887458251 is a `hidden beast` number, since 7 + 8 + 8 + 5 + 588 + 7 + 4 + 5 + 8 + 25 + 1 = 666.

It is not a de Polignac number, because 78855887458251 - 2²⁹ = 78855350587339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78855887458951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8569156 + ... + 15203361.

It is an arithmetic number, because the mean of its divisors is an integer number (4817667180326).

Almost surely, 2^{78855887458251} is an apocalyptic number.

78855887458251 is a deficient number, since it is larger than the sum of its proper divisors (36768124869573).

78855887458251 is a wasteful number, since it uses less digits than its factorization.

78855887458251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23778091 (or 23778088 counting only the distinct ones).

The product of its digits is 8028160000, while the sum is 81.

The spelling of 78855887458251 in words is "seventy-eight trillion, eight hundred fifty-five billion, eight hundred eighty-seven million, four hundred fifty-eight thousand, two hundred fifty-one".