2511865878858 has 96 divisors (see below), whose sum is σ = 6314225374080. Its totient is φ = 706850242560.

The previous prime is 2511865878853. The next prime is 2511865879009. The reversal of 2511865878858 is 8588785681152.

2511865878858 is a `hidden beast` number, since 2 + 511 + 8 + 6 + 58 + 7 + 8 + 8 + 58 = 666.

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2511865878853) 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, 2446213 + ... + 3317783.

It is an arithmetic number, because the mean of its divisors is an integer number (65773180980).

Almost surely, 2^{2511865878858} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2511865878858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3157112687040).

2511865878858 is an abundant number, since it is smaller than the sum of its proper divisors (3802359495222).

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

2511865878858 is a wasteful number, since it uses less digits than its factorization.

2511865878858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871932 (or 871929 counting only the distinct ones).

The product of its digits is 344064000, while the sum is 72.

The spelling of 2511865878858 in words is "two trillion, five hundred eleven billion, eight hundred sixty-five million, eight hundred seventy-eight thousand, eight hundred fifty-eight".