2580566640 has 80 divisors (see below), whose sum is σ = 8119206528. Its totient is φ = 677875968.

The previous prime is 2580566633. The next prime is 2580566669. The reversal of 2580566640 is 466650852.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 2580566592 and 2580566601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64162 + ... + 96321.

Almost surely, 2^2580566640 is an apocalyptic number.

2580566640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2580566640 is an abundant number, since it is smaller than the sum of its proper divisors (5538639888).

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

2580566640 is a wasteful number, since it uses less digits than its factorization.

2580566640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160566 (or 160560 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 2580566640 is about 50799.2779476244. The cubic root of 2580566640 is about 1371.6343717693.

The spelling of 2580566640 in words is "two billion, five hundred eighty million, five hundred sixty-six thousand, six hundred forty".