6861864814155 has 128 divisors (see below), whose sum is σ = 13925348720640. Its totient is φ = 3175931566080.

The previous prime is 6861864814093. The next prime is 6861864814177. The reversal of 6861864814155 is 5514184681686.

6861864814155 is a `hidden beast` number, since 6 + 8 + 61 + 8 + 6 + 481 + 41 + 55 = 666.

It is not a de Polignac number, because 6861864814155 - 2¹⁶ = 6861864748619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6861864814092 and 6861864814101.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 27053454 + ... + 27305916.

It is an arithmetic number, because the mean of its divisors is an integer number (108791786880).

Almost surely, 2^{6861864814155} is an apocalyptic number.

6861864814155 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6861864814155 is an abundant number, since it is smaller than the sum of its proper divisors (7063483906485).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6861864814155 is a wasteful number, since it uses less digits than its factorization.

6861864814155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253418 (or 253412 counting only the distinct ones).

The product of its digits is 44236800, while the sum is 63.

The spelling of 6861864814155 in words is "six trillion, eight hundred sixty-one billion, eight hundred sixty-four million, eight hundred fourteen thousand, one hundred fifty-five".