2678564215872 has 336 divisors, whose sum is σ = 7979354111872. Its totient is φ = 858380820480.

The previous prime is 2678564215871. The next prime is 2678564215883. The reversal of 2678564215872 is 2785124658762.

2678564215872 is a `hidden beast` number, since 2 + 6 + 7 + 8 + 5 + 6 + 42 + 1 + 587 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (2678564215871) 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, 1253421588 + ... + 1253423724.

Almost surely, 2^{2678564215872} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2678564215872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3989677055936).

2678564215872 is an abundant number, since it is smaller than the sum of its proper divisors (5300789896000).

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

2678564215872 is a wasteful number, since it uses less digits than its factorization.

2678564215872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866 (or 2853 counting only the distinct ones).

The product of its digits is 90316800, while the sum is 63.

The spelling of 2678564215872 in words is "two trillion, six hundred seventy-eight billion, five hundred sixty-four million, two hundred fifteen thousand, eight hundred seventy-two".