2566421636725 has 24 divisors (see below), whose sum is σ = 3251336722560. Its totient is φ = 2008672005120.

The previous prime is 2566421636719. The next prime is 2566421636747. The reversal of 2566421636725 is 5276361246652.

2566421636725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2566421636725 - 2⁹ = 2566421636213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2606869 + ... + 3453781.

It is an arithmetic number, because the mean of its divisors is an integer number (135472363440).

Almost surely, 2^{2566421636725} is an apocalyptic number.

2566421636725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2566421636725 is a deficient number, since it is larger than the sum of its proper divisors (684915085835).

2566421636725 is a wasteful number, since it uses less digits than its factorization.

2566421636725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849549 (or 849544 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 55.

The spelling of 2566421636725 in words is "two trillion, five hundred sixty-six billion, four hundred twenty-one million, six hundred thirty-six thousand, seven hundred twenty-five".