2578305805531 has 2 divisors, whose sum is σ = 2578305805532. Its totient is φ = 2578305805530.

The previous prime is 2578305805429. The next prime is 2578305805577. The reversal of 2578305805531 is 1355085038752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2578305805531 - 2¹⁹ = 2578305281243 is a prime.

It is a super-2 number, since 2×2578305805531² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2578405805531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1289152902765 + 1289152902766.

It is an arithmetic number, because the mean of its divisors is an integer number (1289152902766).

Almost surely, 2^{2578305805531} is an apocalyptic number.

2578305805531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2578305805531 is an equidigital number, since it uses as much as digits as its factorization.

2578305805531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040000, while the sum is 52.

The spelling of 2578305805531 in words is "two trillion, five hundred seventy-eight billion, three hundred five million, eight hundred five thousand, five hundred thirty-one".