2566493263540 has 24 divisors (see below), whose sum is σ = 5397131900160. Its totient is φ = 1025169487008.

The previous prime is 2566493263531. The next prime is 2566493263553. The reversal of 2566493263540 is 453623946652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89223912 + ... + 89252671.

It is an arithmetic number, because the mean of its divisors is an integer number (224880495840).

Almost surely, 2^{2566493263540} is an apocalyptic number.

2566493263540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2566493263540 is an abundant number, since it is smaller than the sum of its proper divisors (2830638636620).

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

2566493263540 is a wasteful number, since it uses less digits than its factorization.

2566493263540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178477311 (or 178477309 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 55.

The spelling of 2566493263540 in words is "two trillion, five hundred sixty-six billion, four hundred ninety-three million, two hundred sixty-three thousand, five hundred forty".