2531866521856 has 81 divisors (see below), whose sum is σ = 5879373991239. Its totient is φ = 1085009275392.

The previous prime is 2531866521853. The next prime is 2531866521869. The reversal of 2531866521856 is 6581256681352.

The square root of 2531866521856 is 1591184.

It is a perfect power (a square), and thus also a powerful number.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2531866521856.

It is not an unprimeable number, because it can be changed into a prime (2531866521853) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 178205505 + ... + 178219711.

Almost surely, 2^{2531866521856} is an apocalyptic number.

2531866521856 is the 1591184-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2531866521856

2531866521856 is an abundant number, since it is smaller than the sum of its proper divisors (3347507469383).

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

2531866521856 is an frugal number, since it uses more digits than its factorization.

2531866521856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28444 (or 14216 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 58.

The spelling of 2531866521856 in words is "two trillion, five hundred thirty-one billion, eight hundred sixty-six million, five hundred twenty-one thousand, eight hundred fifty-six".