2578565071540 has 24 divisors (see below), whose sum is σ = 5415018729120. Its totient is φ = 1031419918368.

The previous prime is 2578565071529. The next prime is 2578565071541. The reversal of 2578565071540 is 451705658752.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578565071541) 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 in 7 ways as a sum of consecutive naturals, for example, 4780891 + ... + 5292829.

It is an arithmetic number, because the mean of its divisors is an integer number (225625780380).

Almost surely, 2^{2578565071540} is an apocalyptic number.

2578565071540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2578565071540 is an abundant number, since it is smaller than the sum of its proper divisors (2836453657580).

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

2578565071540 is a wasteful number, since it uses less digits than its factorization.

2578565071540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763791 (or 763789 counting only the distinct ones).

The product of its (nonzero) digits is 11760000, while the sum is 55.

The spelling of 2578565071540 in words is "two trillion, five hundred seventy-eight billion, five hundred sixty-five million, seventy-one thousand, five hundred forty".